Perhaps you should try some spelling variations:
"re decolonization africa" » "re democratization africa", "_ decolonization africa", "re colonization africa", "box decolonization africa"
"_ communication united" » "_ telecommunication united"
"mars cooperation history" » "mars corporation history", "mars federation history", "early cooperation history", "area cooperation history", "arab cooperation history"

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

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