Perhaps you should try some spelling variations:
ghana communications » guiana communications, guyana communications, china communications
developpement west » developpement des, developpement et, development west
der variation » de variation, does variation, die variation
1.1 et » 1.1 el
1.1 eu » 2.1 eu, 1.1 el, 3.1 eu
theorie » theories

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

• If you are trying to use Boolean operators, they must be ALL CAPS: theorie der variation _ new ghana communications ((1.1 et) OR (1.1 eu)) developpement west africa.~.
• Adding a wildcard symbol may retrieve word variants: theorie der variation _ new ghana communications ((1.1 et) or (1.1 eu)) developpement west africa.*.