Perhaps you should try some spelling variations:
approximations algorithms » approximation algorithms, approximation algorithm
rough approximations » one approximation
solution algorithm » evolution algorithm, convolution algorithms, evolutionary algorithm
modified a » modified _, modified df, modified adam
a solution » _ solution, _ solutions, nacl solution

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