Perhaps you should try some spelling variations:
device communication » services communication, voice communication, mobile communication
de developpement » sme development
developpement l » developpement il, developpement la, developpement de
typologie der » typologie des, ideologie der
der variation » de variation, does variation, die variation
l afrique » en afrique
83 debt » 2.3 debt
3 debt » 4 debt, 2.3 debt
a de » a die, a der, a des

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: "typologie der variation ((3 debt) OR (83 debt)) device communication a de developpement l afrique.~".
• Adding a wildcard symbol may retrieve word variants: typologie der variation ((3 debt) OR (83 debt)) device communication a de developpement l afrique.*.