Perhaps you should try some spelling variations:
"administration informatique" » "administration information", "organisation informatique", "migration informatique"
"administrative absorption" » "administrative allocation", "administrative discretion", "administrative information"

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: (("administrative absorption") OR ("administration informatique")).
• Removing quotes may allow a broader search: (( administrative absorption ) or ( administration informatique )).
• Adding a wildcard symbol may retrieve word variants: (("administrative absorption") or ("administration informatique"))*.