Perhaps you should try some spelling variations:
oper communication » open communication, proper communication, power communication
developpements en » developpement en, developpement et, developpements de
variation des » variation _, variation 6, variation series
a variation » la variation, _ variation, 2 variation
apology a » apology _, apology mea, typology a
der oper » der opfer, der oder
des der » des dr, des ddr, des dem
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.

• The words AND, OR and NOT may confuse the search; try adding quotes: "apology a variation des der oper communication ((a des) OR (a das)) developpements en afrique.~".
• Adding a wildcard symbol may retrieve word variants: apology a variation des der oper communication ((a des) OR (a das)) developpements en afrique.*.