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

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

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