Perhaps you should try some spelling variations:
development reports » development report, development efforts, development results
oral communication » personal communication
technology social » technology series
social function » social action, social foundations, social condition
20 development » 2 development, 2015 development, 2007 development
reports africa » exports africa, airports africa, reports asia
function 3.4 » function 3.3, function 4, function _
firm oral » firm rural
3.4 firm » 3.2 firm, 3.3 firm, 3.4 forms
costs 20 » costs 60, costs 2.3, costs 2.1

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

• Adding a wildcard symbol may retrieve word variants: technology social function 3.4 firm oral communication costs 20 development reports africa.*.