Perhaps you should try some spelling variations:
approximation algorithm » approximation algorithms
near approximation » one approximation, network approximation, _ approximation
method algorithm » mom algorithm
modified near » modified seird, modified adam
core using » care nursing

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( ((core using) or (code using)) method algorithm ) or ( modified near approximation algorithm ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( ((core using) OR (code using)) method algorithm ) OR ( modified near approximation algorithm )).
• Adding a wildcard symbol may retrieve word variants: (( ((core using) or (code using)) method algorithm ) or ( modified near approximation algorithm ))*.