Perhaps you should try some spelling variations:
oral communication » personal communication
information 6.5.1 » information 6.1.1, information 6.5.6, information 1.5.2
data development » delta development, doha development, data envelopment
technologies 2 » technologies _, technologies 4
development l » development li, development 1, development law
6.5.1 der » 3.5.1 der, 5.5.1 der, 7.5.1 der
l afrique » en afrique
der oral » der moral, der ort, der orte

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

• Adding a wildcard symbol may retrieve word variants: technologies 2 information 6.5.1 der oral communication media data development l afrique.*.