Perhaps you should try some spelling variations:
developing controlled » developing control, developing countries
de communication » mobile communication, online communication
14 developing » 4 developing, 1 developing, 10 developing
technology 1 » technology _
law decades » last decades, law debates, lost decades
decades de » decades _, decades a, decada de
costs 14 » costs 4, costs 1, costs 11.4
trials. » trial.

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

• Adding a wildcard symbol may retrieve word variants: technology 1 information law decades de communication costs 14 developing controlled trials.*.