Perhaps you should try some spelling variations:
communication cost » communication costs, communication costa, communications costs
per developpement » leur developpement, de developpement, le developpement
technology 21st » technology 2.1.1, technology 2.1.2, technology 2.1.3
developpement l » developpement il, developpement la, developpement de
21st education » post education, ict education, art education
chapter one » chapter four
l afrique » en afrique
one mass » bone mass, one class, one man's

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

• Adding a wildcard symbol may retrieve word variants: technology 21st education chapter one mass communication cost per developpement l afrique.*.