Perhaps you should try some spelling variations:
optimization algorithms » optimisation algorithm, estimation algorithm, optimized algorithms
estimation algorithmss » estimation algorithm
estimation algorithms » estimation algorithm, optimisation algorithm, approximation algorithms
over optimization » qoe optimization, _ optimization, game optimization

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( over optimization algorithms ) or ( qoe ((estimation algorithms) or (estimation algorithmss)) ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( over optimization algorithms ) OR ( qoe ((estimation algorithms) OR (estimation algorithmss)) )).
• Adding a wildcard symbol may retrieve word variants: (( over optimization algorithms ) or ( qoe ((estimation algorithms) or (estimation algorithmss)) ))*.