Perhaps you should try some spelling variations:
oral communication » personal communication
technologien aids » technologien als, technologien ad, technologien des
aids information » chandos information, series information
information 1.2 » information 1.5.2, information 2
developing baga » developing data, developing biogas, developing based
4 developing » 3 developing
baga african » agoa african, bank african, bemba african
non oral » non oil, non arab
1.2 non » 3.2 non, 2.2 non, 4.2 non
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: technologien aids information 1.2 non oral communication costs 4 developing baga african.*.