Perhaps you should try some spelling variations:
communication barriers » communication series, communication disorders
data communication » data communications
formulation des » formation des, formulacion de, formulation _
technologies 4 » technologies _
12 development » 1.2 development, 12 developments, 2 development
4 formulation » _ formulation, 3 formulation, 2 formulation
barriers 12 » barriers 10, barriers 2, barriers 3.2
does data » does cat
1 afrique » l afrique, en afrique, 1 enrique
des does » des doses, der does, des dorfes

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

• Adding a wildcard symbol may retrieve word variants: technologies 4 formulation des does data communication barriers 12 development 1 afrique.*.