Perhaps you should try some spelling variations:
communication cost » communication costs, communication costa, communications costs
low developpement » le developpement, ou developpement, leur developpement
developpement de » developpement des, developpement durable
c information » 2 information, 1 information, 10 information
dust mediated » host mediated, cas9 mediated, ict mediated
technology c » technology 1, technology 3, technology 2
de afrique » de l'afrique, en afrique, l afrique

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

• Adding a wildcard symbol may retrieve word variants: technology c information _ dust mediated communication cost low developpement de afrique.*.