Perhaps you should try some spelling variations:
policies interactions » species interactions, policies integrating, policies reintegration
communication system » communication systems, telecommunication system, telecommunication systems
interactions series » interaction terms, interactions between
effort strategic » reform strategic, export strategies, reforms strategic

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( support policies interactions series. ) or ( effort strategic communication system. ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( support policies interactions series. ) OR ( effort strategic communication system. )).
• Adding a wildcard symbol may retrieve word variants: (( support policies interactions series. ) or ( effort strategic communication system. ))*.