Perhaps you should try some spelling variations:
estimation algorithms » estimation algorithm, optimization algorithms, optimisation algorithm
parameter estimation » parameter estimates, parameter optimization
same optimization » game optimization, stage optimization, market optimization
qoe optimization » game optimization, _ optimization, stage optimization

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

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