Perhaps you should try some spelling variations:
approximations algorithm » approximation algorithm, approximation algorithms
optimization algorithm » optimization algorithms, optimisation algorithm, estimation algorithm
rough approximations » one approximation
market optimization » game optimization, parameter optimization, market capitalization

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: (( rough approximations algorithm ) OR ( market optimization algorithm ))~.
• Adding a wildcard symbol may retrieve word variants: (( rough approximations algorithm ) or ( market optimization algorithm ))*.