Perhaps you should try some spelling variations:
information centers » information contents, information officers
communication cost » communication costs, communication costa, communications costs
technologies 2.1 » technologies _, technologies 4, technologies a
et communication » et communicatione, get communication, debt communication
2.1 information » 3.1 information
developing baga » developing data, developing biogas, developing based
14 developing » 4 developing, 1 developing, 10 developing
baga african » agoa african, bank african, bemba african
centers 3 » centers _, centers a, centers 3.3
cost 14 » cost 4, cost 12, cost 15
3 et » 13 et, 3 fet, 3 set

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

• Adding a wildcard symbol may retrieve word variants: technologies 2.1 information centers 3 et communication cost 14 developing baga african.*.