Perhaps you should try some spelling variations:
connection service » collection services, conservation service, connection string
connector service » connection services, connected services, sector service
actor services » actor service, factory services, sector services

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: ((((connector service) OR (connection service))) OR (actor services)).
• Adding a wildcard symbol may retrieve word variants: ((((connector service) or (connection service))) or (actor services))*.