Perhaps you should try some spelling variations:
"its communication sector" » "its telecommunication sector", "its telecommunications sector", "its communication series", "nets communication sector", "c's communication sector", "mass communication sector"
"its cooperation history" » "its corporation history", "its federation history", "city cooperation history", "et cooperation history"
"its colonization songs" » "its colonization still", "its colonization work", "its decolonization notes", "anti colonization songs", "jews colonization songs", "mars colonization songs"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("its communication sector") or ("its colonization songs"))) or ("its cooperation history"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("its communication sector") OR ("its colonization songs"))) OR ("its cooperation history"))*.
• Removing quotes may allow a broader search: (((( its communication sector ) or ( its colonization songs ))) or ( its cooperation history ))*.