Perhaps you should try some spelling variations:
developpement economiques » developpement economique (Expand Search)
de developpement » _ development (Expand Search)
organisation du » organisation de (Expand Search), organisation des (Expand Search), organisation _ (Expand Search)
du cooperation » de cooperation (Expand Search), _ cooperation (Expand Search), la cooperation (Expand Search)
cooperation et » cooperation en (Expand Search), cooperation egtc (Expand Search), cooperation des (Expand Search)