Perhaps you should try some spelling variations:
module communications » mobile communications, mobile communication, house communications
communications costs » communication costs, communications _
interaction farm » interaction term, interaction from, interaction terms
development li » development lid, development lie, development lin
5 development » 2 development, 3 development, 3.1 development
data module » stata module, data model, data models
li afrique » l afrique, en afrique
farm data » firm data, farm gate, farm dams
costs 5 » costs _, costs 4, costs a

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

• Adding a wildcard symbol may retrieve word variants: technologies _ interaction farm data module communications costs 5 development li afrique.*.