Perhaps you should try some spelling variations:
computation representation » computational representation, communication representation, computation implementation
population representation » population implementation, solution representation, motivation representation
methods reaction » methods reactions, methods section, methods action
reaction recent » reactions recent, education recent
recent libre » recent life, recent large, recent lgbt

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 representation) OR (computation representation)) methods reaction recent libre~.
• Adding a wildcard symbol may retrieve word variants: ((population representation) or (computation representation)) methods reaction recent libre*.