Perhaps you should try some spelling variations:
optimization algorithmss » optimization algorithms, optimisation algorithm, estimation algorithms
passive estimation » pose estimation
qoe optimization » game optimization, _ optimization, stage optimization
modified passive » modified adaptive
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: (( modified qoe optimization algorithmss ) OR ( modified passive estimation algorithm ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( modified qoe optimization algorithmss ) OR ( modified passive estimation algorithm ))".
• Adding a wildcard symbol may retrieve word variants: (( modified qoe optimization algorithmss ) OR ( modified passive estimation algorithm ))*.