Perhaps you should try some spelling variations:
politique economiques » politiques economiques, politique economique, politico economiques
agiles developpement » web developpement
cahier des » cahier de
cahiers de » cahier de, chantiers de
a centre » _ centre, a century, a center

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((cahier des) OR (cahiers de)) politique economiques ((a centre) OR (a central)) agiles developpement de l'ocde.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((cahier des) OR (cahiers de)) politique economiques ((a centre) or (a central)) agiles developpement de l'ocde".
• Adding a wildcard symbol may retrieve word variants: ((cahier des) OR (cahiers de)) politique economiques ((a centre) or (a central)) agiles developpement de l'ocde*.