diff --git a/app.py b/app.py
index b096550..accc008 100644
--- a/app.py
+++ b/app.py
@@ -148,8 +148,21 @@ def search_customers(search_params):
         # Allgemeine Suche über alle Felder
         if search_params.get('q'):
             search_term = f"%{search_params['q']}%"
-            query += " AND (name LIKE ? OR ort LIKE ? OR nummer LIKE ? OR telefon LIKE ? OR mobil LIKE ? OR email LIKE ? OR bemerkung LIKE ? OR fachrichtung LIKE ?)"
-            params.extend([search_term] * 8)
+            operator = search_params.get('operator', 'or').upper()
+            
+            if operator == 'AND':
+                # Bei UND-Verknüpfung müssen alle Begriffe in mindestens einem Feld vorkommen
+                terms = search_params['q'].split()
+                conditions = []
+                for term in terms:
+                    term = f"%{term}%"
+                    conditions.append("(name LIKE ? OR ort LIKE ? OR nummer LIKE ? OR telefon LIKE ? OR mobil LIKE ? OR email LIKE ? OR bemerkung LIKE ? OR fachrichtung LIKE ?)")
+                    params.extend([term] * 8)
+                query += " AND " + " AND ".join(conditions)
+            else:
+                # Bei ODER-Verknüpfung (Standard) muss mindestens ein Begriff in einem Feld vorkommen
+                query += " AND (name LIKE ? OR ort LIKE ? OR nummer LIKE ? OR telefon LIKE ? OR mobil LIKE ? OR email LIKE ? OR bemerkung LIKE ? OR fachrichtung LIKE ?)"
+                params.extend([search_term] * 8)
         
         # Spezifische Suche für einzelne Felder
         if search_params.get('name'):
@@ -292,7 +305,8 @@ def search():
             'telefon': request.args.get('telefon', ''),
             'email': request.args.get('email', ''),
             'q': request.args.get('q', ''),
-            'fachrichtung': request.args.get('fachrichtung', '')
+            'fachrichtung': request.args.get('fachrichtung', ''),
+            'operator': request.args.get('operator', 'or')
         }
         
         # Führe die Suche in der Datenbank durch
diff --git a/static/css/styles.css b/static/css/styles.css
index a6d528b..1f54322 100644
--- a/static/css/styles.css
+++ b/static/css/styles.css
@@ -235,4 +235,22 @@ body {
 .general-search .reset-icon {
     font-size: 1.2rem;
     padding: 0 1rem;
+}
+
+.search-options {
+    font-size: 0.9em;
+    color: #666;
+}
+
+.search-options .form-check {
+    margin-right: 1rem;
+}
+
+.search-options .form-check-input {
+    cursor: pointer;
+}
+
+.search-options .form-check-label {
+    cursor: pointer;
+    user-select: none;
 } 
\ No newline at end of file
diff --git a/templates/index.html b/templates/index.html
index 616f2f7..145eca4 100644
--- a/templates/index.html
+++ b/templates/index.html
@@ -24,6 +24,16 @@
                         <i class="fas fa-times reset-icon" onclick="clearInput('q')"></i>
                         <i class="fas fa-search search-icon"></i>
                     </div>
+                    <div class="search-options mt-2">
+                        <div class="form-check form-check-inline">
+                            <input class="form-check-input" type="radio" name="searchOperator" id="searchOr" value="or" checked>
+                            <label class="form-check-label" for="searchOr">ODER</label>
+                        </div>
+                        <div class="form-check form-check-inline">
+                            <input class="form-check-input" type="radio" name="searchOperator" id="searchAnd" value="and">
+                            <label class="form-check-label" for="searchAnd">UND</label>
+                        </div>
+                    </div>
                 </div>
 
                 <div class="search-fields">
@@ -278,6 +288,7 @@
             const nummer = document.getElementById('nummerInput').value;
             const plz = document.getElementById('plzInput').value;
             const fachrichtung = document.getElementById('fachrichtungInput').value;
+            const searchOperator = document.querySelector('input[name="searchOperator"]:checked').value;
 
             // Zeige das Lade-Icon
             document.getElementById('loading').style.display = 'block';
@@ -290,6 +301,7 @@
             if (nummer) params.append('nummer', nummer);
             if (plz) params.append('plz', plz);
             if (fachrichtung) params.append('fachrichtung', fachrichtung);
+            if (searchOperator) params.append('operator', searchOperator);
 
             // Führe die Suche durch
             fetch('/search?' + params.toString())