Perhaps you should try some spelling variations:
optimization algorithmss » optimization algorithms, optimisation algorithm, estimation algorithms
sphere optimization » sphere estimation, stage optimization, response optimization
game optimization » stage optimization, market optimization, _ optimization
qoe optimization » _ optimization, stage optimization, _ optimisation

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

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