Perhaps you should try some spelling variations:
crisis communication » risk communication, mass communication
separation using » operation using, separation among, separation und
l developpement » le developpement, de developpement, et developpement
developpement l » developpement il, developpement la, developpement de
air separation » a separation, after separation, first separation
ideologie air » ideologie der, ideologie a, ideologie als
les crisis » las crisis, les crises, its crisis
using les » using less, using aes, using files
l afrique » en afrique
a l » a la

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

• Adding a wildcard symbol may retrieve word variants: ideologie air separation using les crisis communication a l developpement l afrique.*.