Perhaps you should try some spelling variations:
oper communication » open communication, proper communication, power communication
developpements en » developpement en, developpement et, developpements de
do's variation » does variation, modes variation, de variation
topology do's » apology do's
variation 6 » variation _, variations _, variation des
der oper » der opfer, der oder
6 der » _ der, 2 der, 3 der
a des » a der
a das » 1 das, 2 das, 3 das

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

• Performing a fuzzy search may retrieve terms with similar spellings: topology do's variation 6 der oper communication ((a des) OR (a das)) developpements en afrique.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "topology do's variation 6 der oper communication ((a des) OR (a das)) developpements en afrique.*".