Perhaps you should try some spelling variations:
communication documentation » communication foundation, communication communication, communication conversation
population documentation » education documentation, population implementation, evaluation documentation
methods decision » methods design, ethics decision, methods session
decision de » decision _, decision a, decision game
de libre » de livres, de lie, _ libre

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((communication documentation) or (population documentation)) methods decision de libre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((communication documentation) OR (population documentation)) methods decision de libre.
• Adding a wildcard symbol may retrieve word variants: ((communication documentation) or (population documentation)) methods decision de libre*.