Perhaps you should try some spelling variations:
optimisation algorithm » optimization algorithms, estimation algorithm, estimation algorithms
policy optimisation » policy optimization, topology optimization
some optimization » game optimization, stage optimization, smooth 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: (( ((some optimization) OR (qoe optimization)) algorithms ) or ( policy optimisation algorithm ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( ((some optimization) OR (qoe optimization)) algorithms ) OR ( policy optimisation algorithm ))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( ((some optimization) OR (qoe optimization)) algorithms ) or ( policy optimisation algorithm ))*".