Perhaps you should try some spelling variations:
personal communication » interpersonal communication
information centre » information centers, information contents
technologies 3 » technologies _, technologies 4, technologies 2
3 information » 1 information
self personal » helps personal, skill personal, der personal
4 developing » 3 developing
centre self » century self, genre self, culture self
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: technologies 3 information centre self personal communication costs 4 developing _ africa.*.