Perhaps you should try some spelling variations:
communication documentation » communication foundation, communication communication, communication conversation
population documentation » education documentation, population implementation, evaluation documentation
methods decisions » methods decision, method decision, methods designs
decisions de » decisions e, decisions get, decisions _
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 decisions de libre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((communication documentation) OR (population documentation)) methods decisions de libre.
• Adding a wildcard symbol may retrieve word variants: ((communication documentation) or (population documentation)) methods decisions de libre*.