Perhaps you should try some spelling variations:
optimization algorithms » estimation algorithms, estimation algorithm, optimizer algorithms
optimisation algorithm » estimation algorithm, estimation algorithms
optimized algorithms » optimized algorithm, optimizer algorithms
risk optimisation » _ optimisation, risk estimation

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( qoe ((optimization algorithms) OR (optimized algorithms)) ) or ( risk optimisation algorithm ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( qoe ((optimization algorithms) OR (optimized algorithms)) ) OR ( risk optimisation algorithm ))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( qoe ((optimization algorithms) OR (optimized algorithms)) ) or ( risk optimisation algorithm ))*".