Perhaps you should try some spelling variations:
communications costs » communication costs, communications _
cooperation sources » cooperation series, cooperation studies, cooperation countries
de communications » de communication, do communications, mce communications
based development » basin development, land development, rapid development
development may » development main, development make, development mali
costs based » cost based, costs case, hots based
sources de » sources _, sources 4, sources 5
de de » e de, de ce, de se

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

• Adding a wildcard symbol may retrieve word variants: technologies _ cooperation sources de de communications costs based development may afrique.*.