Perhaps you should try some spelling variations:
personal communication » interpersonal communication
variation series » education series, action series, edition series
de developpement » sme development
developpement en » developpement et, developpement des, developpement de
typologie its » typologie des, typologie et, typologie cices
its variation » its variations, does variation, les variations
der personal » der personalen, der personen, der person
series der » serien der, series de, series d
a de » a die, a der, a des

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

• Adding a wildcard symbol may retrieve word variants: typologie its variation series der personal communication a de developpement en afrique.*.