Perhaps you should try some spelling variations:
"news organisations theory" » "news organizations theory", "news organisation theory", "news organization theory", "new organisations theory", "des organisations theory", "les organisations theory"
"pro colonization history" » "pro communication history", "pro organization history", "pro cooperation history", "bio colonization history", "re colonization history", "mars colonization history"
"early migration history" » "family migration history", "early admiration history", "energy migration history"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("news organisations theory") OR ((("pro colonization history") OR ("early migration history"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"news organisations theory\") OR (((\"pro colonization history\") OR (\"early migration history\"))))*".
• Removing quotes may allow a broader search: (( news organisations theory ) OR ((( pro colonization history ) OR ( early migration history ))))*.