Perhaps you should try some spelling variations:
approximations algorithms » approximation algorithms, approximation algorithm
rough approximations » one approximation
solution algorithms » solution algorithm, evolution algorithm, convolution algorithms
modified saline » modified caging, modified male, modified passive

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