Perhaps you should try some spelling variations:
communication barriers » communication series, communication disorders
technologies model » technological model, technologies modelling, technological models
model formulation » model simulation, budget formulation, model simulations
formulation des » formation des, formulacion de, formulation _
d developpement » de developpement, du developpement, le developpement
developpement l » developpement il, developpement la, developpement de
barriers d » barriers _, barriers a, barriers 4
l afrique » en afrique
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 model formulation des does _ communication barriers d developpement l afrique.*.