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