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

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

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