Perhaps you should try some spelling variations:
implementation methods » implantation methods, implementation options, instrumentation methods
implementation method » implantation methods, implementation options, implementation model
decision belief » revision belief, religion belief, session belief
belief bites » belief bases, belief it's, belief based

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: population ((implementation method) OR (implementation methods)) decision belief bites~.
• Adding a wildcard symbol may retrieve word variants: population ((implementation method) or (implementation methods)) decision belief bites*.