Perhaps you should try some spelling variations:
personal communication » interpersonal communication
der developpement » de developpement, des developpements, leur developpement
variation using » variations during, variation und, variation among
maybe personal » manage personal, have personal, more personal
typologie de » typologie des, typologie der, typologien der
de variation » der variation, die variation, does variation
using maybe » using maple, using market
des afrique » en afrique, de l'afrique
a der » _ der, 2 der, 3 der

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

• Adding a wildcard symbol may retrieve word variants: typologie de variation using maybe personal communication a der developpement des afrique.*.