Perhaps you should try some spelling variations:
investment protection » investment promotion, investor protection, investment projects
protection strategy » reduction strategy, protection rates
debtor protection » labor protection, deer protection, depositor protection
protection level » protection levels, production level, protection legal
private debtor » private debtors, private sector, private debt
can private » das private, scale private, cost private

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( can private investment protection level ) or ( can private debtor protection strategy ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( can private investment protection level ) OR ( can private debtor protection strategy )).
• Adding a wildcard symbol may retrieve word variants: (( can private investment protection level ) or ( can private debtor protection strategy ))*.