Perhaps you should try some spelling variations:
communications costs » communication costs, communications _
transfer extraction » transfer operation, parameter extraction
development rates » development rate, development notes, development water
doha development » a development, 2 development
rates africa » state africa
costs doha » costs data, costs down
e data » e datas, age data, cge data

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

• Adding a wildcard symbol may retrieve word variants: technology transfer extraction _ e data communications costs doha development rates africa.*.