Perhaps you should try some spelling variations:
optimization algorithms » optimisation algorithm, estimation algorithms, estimation algorithm
optimization algorithm » optimisation algorithm, estimation algorithm, estimation algorithms
qoe optimization » game optimization, stage optimization, _ optimisation
modified qoe » modified male, modified bi1, modified df

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

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