Perhaps you should try some spelling variations:
technological frontier » technology frontier
frontier formation » frontier foundation, frontier estimation, frontier conservation
face communication » voice communication, de communication, time communication
developpement yes » developpement des, developpement de, developpement et
formation needs » information needs, information need, formation des
d developpement » de developpement, du developpement, le developpement
needs five » needs life, needs time, needs figure
yes africa » em africa, cycles africa, rates africa
five face » five force, five facts, five case

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

• Adding a wildcard symbol may retrieve word variants: technological frontier formation needs five face communication a d developpement yes africa.*.