Perhaps you should try some spelling variations:
oral communication » personal communication
clean development » human development, urban development
technologies can » technologies a, technologies co, technologies _
can information » von information, von informationen
costs clean » costs clear
bank africa » bank's africa, can africa, banking africa
de oral » de otras, new 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 can information _ de oral communication costs clean development bank africa.~.
• Adding a wildcard symbol may retrieve word variants: technologies can information _ de oral communication costs clean development bank africa.*.