Perhaps you should try some spelling variations:
communication barriers » communication series, communication disorders
technologies model » technological model, technologies modelling, technological models
model formulacion » model formulation, model simulation, mdp formulation
de developpement » sme development
e communication » de communication, 1 communication, une communication
developpement l » developpement il, developpement la, developpement de
formulacion de » formulation des, formacion de, formulation _
barriers de » barriers d, barriere der, barriers key
l afrique » en afrique
de does » der does, do does, one does
does e » does de, does _, does a

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

• Adding a wildcard symbol may retrieve word variants: technologies model formulacion de does e communication barriers de developpement l afrique.*.