Perhaps you should try some spelling variations:
personal communication » interpersonal communication
technologies 4.1 » technologies 2.1, technologies 3.1, technologies 3.2
4.1 informations » 4.1 information, 4.2 informations, 4.4.1 informations
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 4.1 informations und de personal communication costs 4 developing asia areal.*.