Perhaps you should try some spelling variations:
"economics et developpement" » "economics _ development", "economics new development", "economics _ developpement", "economies _ developpement"
"economics fast developpement" » "economics base developpement", "economics from developpement"
"economics cam developpement" » "economics base developpement", "economics from developpement", "economics _ developpement"

Try widening your search to All Fields.

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((((("economics et developpement") OR ("economic _ developpement"))) or ("economics cam developpement"))) or ("economics fast developpement"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((((("economics et developpement") OR ("economic _ developpement"))) OR ("economics cam developpement"))) OR ("economics fast developpement")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((\"economics et developpement\") OR (\"economic _ developpement\"))) or (\"economics cam developpement\"))) or (\"economics fast developpement\"))".
• Removing quotes may allow a broader search: (((((( economics et developpement ) OR ( economic _ developpement ))) or ( economics cam developpement ))) or ( economics fast developpement )).
• Adding a wildcard symbol may retrieve word variants: (((((("economics et developpement") OR ("economic _ developpement"))) or ("economics cam developpement"))) or ("economics fast developpement"))*.