diff --git a/coperator.go b/coperator.go
index ee037e0..3b6cc5d 100644
--- a/coperator.go
+++ b/coperator.go
@@ -159,4 +159,7 @@ func init() {
 	operatorMap["$ne"] = operatorNe
 	operatorMap["$in"] = operatorIn
 	operatorMap["$nin"] = operatorNotIn
+	operatorMap["$and"] = operatorAnd
+	operatorMap["$or"] = operatorOr
+	operatorMap["$nor"] = operatorNor
 }
diff --git a/logic.go b/logic.go
new file mode 100644
index 0000000..20751c4
--- /dev/null
+++ b/logic.go
@@ -0,0 +1,51 @@
+package coperator
+
+import "errors"
+
+func operatorAnd(doc *Document, filter Filter, key string, value interface{}) (bool, error) {
+	vfilter, ok := filter.([]interface{})
+	if !ok {
+		return false, errors.New("filter must be a slice")
+	}
+	for _, v := range vfilter {
+		ret, err := DocumentOperator(doc, v.(Filter), "", nil)
+		if !ret {
+			return ret, err
+		}
+	}
+	return true, nil
+}
+
+func operatorOr(doc *Document, filter Filter, key string, value interface{}) (bool, error) {
+	vfilter, ok := filter.([]interface{})
+	if !ok {
+		return false, errors.New("filter must be a slice")
+	}
+	for _, v := range vfilter {
+		ret, err := DocumentOperator(doc, v.(Filter), "", nil)
+		if err != nil {
+			return false, err
+		}
+		if ret {
+			return ret, err
+		}
+	}
+	return false, nil
+}
+
+func operatorNor(doc *Document, filter Filter, key string, value interface{}) (bool, error) {
+	vfilter, ok := filter.([]interface{})
+	if !ok {
+		return false, errors.New("filter must be a slice")
+	}
+	for _, v := range vfilter {
+		ret, err := DocumentOperator(doc, v.(Filter), "", nil)
+		if err != nil {
+			return false, err
+		}
+		if ret {
+			return false, nil
+		}
+	}
+	return true, nil
+}