Perhaps you should try some spelling variations:
communication barriers » communication series, communication disorders
pt communication » put communication, et communication, post communication
developpement en » developpement et, developpement des, developpement de
a developpement » au developpement, de developpement, le developpement
formal labor » rural labor, local labor, total labor
barriers a » barriers _, barrier _
labor one » labor code, labor cote, labor die
one pt » one part

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

• Adding a wildcard symbol may retrieve word variants: technologien _ formal labor one pt communication barriers a developpement en afrique.*.