Perhaps you should try some spelling variations:
vector cooperation » sector cooperation, sectoral cooperation, century cooperation
cooperation costs » operation costs, cooperation across, cooperation case
de developpement » sme development
developpement de » developpement des, developpement durable
information p » information pt, information 1, information psi
wave vector » state vector, five vectors, value vector
costs de » costs _, costs 4, costs a
p wave » _ wave, a wave

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

• Adding a wildcard symbol may retrieve word variants: technology _ information p wave vector cooperation costs de developpement de l'afrique.*.