Perhaps you should try some spelling variations:
communications costs » communication costs, communications _
chapter information » computer information, change information, career information
4 developpement » de developpement, le developpement, et developpement
developpement l » developpement il, developpement la, developpement de
l afrique » en afrique
pet data » det data, set data, debt data
3.2 pet » 4.2 pet, 7.2 pet, 8.2 pet
costs 4 » costs _, costs a, costs 4.2

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

• Adding a wildcard symbol may retrieve word variants: techniques chapter information 3.2 pet data communications costs 4 developpement l afrique.*.