Perhaps you should try some spelling variations:
optimization algorithms » optimisation algorithm, estimation algorithms, estimation algorithm
optimizer algorithms » optimized algorithm
optimized algorithms » optimized algorithm
sphere optimization » sphere estimation, stage optimization, response optimization

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

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