Perhaps you should try some spelling variations:
communication cost » communication costs, communication costa, communications costs
oral communication » personal communication
technology sector » technology series, technology social
sector function » sector functions, sector frictions, cantor function
2.2 development » 3.2 development, 2.3 development, 4.2 development
development aid » development a, development africa, development agenda
function 3.4 » function 3.3, function 4, function _
aid american » all american, a american, aid african
can oral » can deal, can oil
cost 2.2 » costs 2.2, cost 2.4, cost 3.2
3.4 can » 23.4 can, 5.4 can, 1.4 can

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

• Adding a wildcard symbol may retrieve word variants: technology sector function 3.4 can oral communication cost 2.2 development aid american.*.