Perhaps you should try some spelling variations:
optimization algorithm » optimization algorithms, optimisation algorithm, estimation algorithm
qoe optimization » game optimization, _ optimization, stage optimization
machines using » machinery using
using methods » nursing methods, making methods, counting methods
modified qoe » modified male, modified _, modified bi1

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

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