Perhaps you should try some spelling variations:
data communication » data communications
separation using » operation using, separation among, separation und
communication et » communication 3, communication 1, communication 2
de developpement » sme development
developpement en » developpement et, developpement des, developpement de
der separation » order separation, air separation, ree separation
apologien der » typologien der, apologie des, ideologien der
using trial » using triad, using aerial, ring trial
trial data » real data

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

• Adding a wildcard symbol may retrieve word variants: apologien der separation using trial data communication et de developpement en afrique.*.