Perhaps you should try some spelling variations:
"re democratization africa" » "re democratization china", "re democratization mexico", "re decolonization africa", "_ democratization africa", "13 democratization africa", "2 democratization africa"
"_ communication united" » "_ telecommunication united"
"mars colonization history" » "mars communication history", "mars organization history", "mars cooperation history", "mrsa colonization history", "its colonization history", "jews colonization 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 democratization africa") or ("_ communication united"))) or ("mars colonization history"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("re democratization africa") OR ("_ communication united"))) OR ("mars colonization history"))*.
• Removing quotes may allow a broader search: (((( re democratization africa ) or ( _ communication united ))) or ( mars colonization history ))*.