Perhaps you should try some spelling variations:
"nets communication theory" » "nets communication technology", "lea's communication theory", "mass communication theory", "c's communication theory"
"africa colonization still" » "arrival colonization still", "africa cooperation still", "africa organization still", "africa colonization failed", "africa colonization israel"
"its colonization songs" » "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: (((("africa colonization still") or ("its colonization songs"))) or ("nets communication theory"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("africa colonization still") OR ("its colonization songs"))) OR ("nets communication theory"))*.
• Removing quotes may allow a broader search: (((( africa colonization still ) or ( its colonization songs ))) or ( nets communication theory ))*.