Perhaps you should try some spelling variations:
oral communication » personal communication
clean development » human development, urban development
information flow » information flows
costs clean » costs clear
bank africa » bank's africa, can africa, banking africa
flow 1 » flow _
1 oral » 10 oral, 14 oral, 16 oral

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

• Performing a fuzzy search may retrieve terms with similar spellings: technologies _ information flow 1 oral communication costs clean development bank africa.~.
• Adding a wildcard symbol may retrieve word variants: technologies _ information flow 1 oral communication costs clean development bank africa.*.