Perhaps you should try some spelling variations:
optimization algorithms » optimisation algorithm, estimation algorithm, optimized algorithms
estimation algorithms » estimation algorithm, optimisation algorithm, approximation algorithms
qoe optimization » game optimization, _ optimization, stage optimization
post estimation » pose estimation, risk estimation, pulses estimation

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

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