Perhaps you should try some spelling variations:
communications costs » communication costs, communications _
technology trade » technology trends, technology transfer, technology transfers
developpement en » developpement et, developpement des, developpement de
trade sector » care sector
sector based » vector based, sector case, sensor based
based face » biased face, based facade, based facies
face data » place data, force data, space data

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

• Adding a wildcard symbol may retrieve word variants: technology trade sector based face data communications costs _ developpement en afrique.*.