Perhaps you should try some spelling variations:
communication series » communication services, communication systems, communication skills
cooperation history » corporation history, federation history
les communication » les communications, lea's communication, nets communication
its cooperation » city cooperation, et cooperation, its corporation
nets community » needs community, tents community, arts community

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((( les communication series ) or ( nets community issues ))) or ( its cooperation history ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((( les communication series ) OR ( nets community issues ))) OR ( its cooperation history )).
• Adding a wildcard symbol may retrieve word variants: (((( les communication series ) or ( nets community issues ))) or ( its cooperation history ))*.