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
4.2 developing » 2.2 developing, 3.2 developing, 4.1 developing
de personal » der personal, des personal, de persona
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 4.2 developing asia areal.*.