Perhaps you should try some spelling variations:
optimization algorithms » optimisation algorithm, estimation algorithms, estimation algorithm
time approximation » _ approximation
game optimization » stage optimization, qoe optimization, market optimization
one approximation » _ approximation, rough approximations

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: (( game optimization algorithms ) OR ( ((one approximation) OR (time approximation)) algorithm ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( game optimization algorithms ) or ( ((one approximation) OR (time approximation)) algorithm ))~".
• Adding a wildcard symbol may retrieve word variants: (( game optimization algorithms ) or ( ((one approximation) OR (time approximation)) algorithm ))*.