Perhaps you should try some spelling variations:
"l'etude du centre de developpement" » "l'etude du centre web developpement", "l'etude du centre agiles developpement", "l'etude de centre de developpement", "l'etude des centre de developpement", "l'etude _ centre de developpement", "l'etude a centre de developpement", "l'etude du centre _ developpement"
"etude le centre de developpement" » "etude le centre web developpement", "etude le centre agiles developpement", "etude le centre _ developpement", "etude le contre de developpement", "etude _ centre de developpement", "etude a centre de developpement", "etude de centre de developpement", "etudie les centre de developpement", "etudes de centre de developpement"

Try widening your search to All Fields.

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: (("l'etude du centre de developpement") OR ("etude le centre de developpement")).
• Removing quotes may allow a broader search: (( l'etude du centre de developpement ) or ( etude le centre de developpement )).
• Adding a wildcard symbol may retrieve word variants: (("l'etude du centre de developpement") or ("etude le centre de developpement"))*.