Perhaps you should try some spelling variations:
personal communication » interpersonal communication
developing areas » developing asia, developing east, developing a
4 developing » 3 developing
areas africa » arabs africa, dress africa, farmers africa
de personal » der personal, des personal, de persona
costs 4 » costs _, costs a, costs 4.2
3.2 de » 3.2 die, 3.2 der, 3.2 dem

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

• Adding a wildcard symbol may retrieve word variants: technologies _ information 3.2 de personal communication costs 4 developing areas africa.*.