Perhaps you should try some spelling variations:
personal communication » interpersonal communication
technologies 2.1 » technologies _, technologies 4, technologies a
2.1 informations » 2.1 information, 9.2.1 informations, 3.1 information
developing asia » development asia, developing a
4 developing » 3 developing
de personal » der personal, des personal, de persona
costs 4 » costs _, costs a, costs 4.2
und de » und der, und des, und den
areal. » areas., area., real.

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

• Adding a wildcard symbol may retrieve word variants: technologies 2.1 informations und de personal communication costs 4 developing asia areal.*.