Perhaps you should try some spelling variations:
"molecular interaction" » "molecular detection", "intermolecular interactions", "molecular identification"
"molecular interactions" » "molecular detections", "intermolecular interactionss", "molecular identifications"
"molecular detections" » "molecular detection", "molecular detectors", "molecule detection"

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (("molecular interaction") OR ((("molecular interactions") OR ("molecular detections")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"molecular interaction\") or (((\"molecular interactions\") OR (\"molecular detections\"))))".
• Removing quotes may allow a broader search: (( molecular interaction ) or ((( molecular interactions ) OR ( molecular detections )))).
• Adding a wildcard symbol may retrieve word variants: (("molecular interaction") or ((("molecular interactions") OR ("molecular detections"))))*.