Perhaps you should try some spelling variations:
crisis communication » risk communication, mass communication
developpement de » developpement des, developpement durable
air separation » a separation, after separation, first separation
separation und » separation unit, separation index, separation using
ideologie air » ideologie der, ideologie a, ideologie als
de afrique » de l'afrique, en afrique, l afrique
le crisis » de crisis, pre crisis, age crisis
und le » und leo, und leib, und lege

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: "ideologie air separation und le crisis communication ((a l) OR (a la)) developpement de afrique.~".
• Adding a wildcard symbol may retrieve word variants: ideologie air separation und le crisis communication ((a l) OR (a la)) developpement de afrique.*.