Perhaps you should try some spelling variations:
"de cooperation history" » "de corporation history", "de federation history", "2 cooperation history", "trade cooperation history", "area cooperation history"
"de communication iran" » "de communication iraq", "de communication ireland", "de communication brands", "mobile communication iran", "online communication iran"
"lea's organization theory" » "learning organization theory", "women's organizations theory"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("de communication iran") OR ((("lea's organization theory") OR ("de cooperation history"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"de communication iran\") OR (((\"lea's organization theory\") OR (\"de cooperation history\"))))*".
• Removing quotes may allow a broader search: (( de communication iran ) OR ((( lea's organization theory ) OR ( de cooperation history ))))*.