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

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

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