Perhaps you should try some spelling variations:
"_ communication history" » "_ telecommunication history", "_ communication sector", "_ communication theory"
"mars decolonization models" » "mars decolonization notes", "mars decolonization across", "mars decolonization case", "mars colonization models", "war decolonization models", "empire decolonization models"
"pro colonization failed" » "pro colonization still", "pro organizations failed", "bio colonization failed", "re colonization failed", "mars colonization failed"

Try widening your search to All Fields.

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("mars decolonization models") or ("pro colonization failed"))) or ("_ communication history"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("mars decolonization models") OR ("pro colonization failed"))) OR ("_ communication history")).
• Removing quotes may allow a broader search: (((( mars decolonization models ) or ( pro colonization failed ))) or ( _ communication history )).
• Adding a wildcard symbol may retrieve word variants: (((("mars decolonization models") or ("pro colonization failed"))) or ("_ communication history"))*.