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

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

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