Perhaps you should try some spelling variations:
de communication » mobile communication, online communication
technologies a » technologies _, technologies 4, technologies 2
3.3 developing » 4 developing, 2 developing, 1 developing
payments how » payments flows, payments _, payments a
developing e » developing _, developing a, developing east
a informal » 6a informal, _ informal, 3 informal
costs 3.3 » costs 2.3, costs 3.5, costs 4.3
e africa » em africa, de africa, eu africa
how de » how doe, how do, how ae

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

• Adding a wildcard symbol may retrieve word variants: technologies a informal payments how de communication costs 3.3 developing e africa.*.