Perhaps you should try some spelling variations:
"re decolonization across" » "re decolonization africa", "re decolonization case", "re decolonization from", "_ decolonization across", "re colonization across", "box decolonization across"
"mars communication history" » "mars telecommunication history", "mars communication sector", "mars communication theory", "mass communication history", "mass communications history", "markets communication history"
"_ colonization still" » "_ colonization failed", "_ colonization israel", "_ colonization songs", "_ decolonization still", "decolonization _ still"

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"re decolonization across\") OR (\"_ colonization still\"))) OR (\"mars communication history\"))~".
• Removing quotes may allow a broader search: (((( re decolonization across ) OR ( _ colonization still ))) OR ( mars communication history ))~.
• Adding a wildcard symbol may retrieve word variants: (((("re decolonization across") OR ("_ colonization still"))) OR ("mars communication history"))*.