Perhaps you should try some spelling variations:
voice communication » voice communications, mobile communication, device communication
de developpement » sme development
developpement en » developpement et, developpement des, developpement de
formation among » formalization among, formation across
ideologie der » ideologie und, typologie der
der formation » der information, der reformation, der formativen
among donor » among donors, among doctors
donor voice » donor choice, donor policy
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: ideologie der formation among donor voice communication a de developpement en afrique.*.