Perhaps you should try some spelling variations:
approximation algorithm » approximation algorithms
solution algorithm » evolution algorithm, convolution algorithms, evolutionary algorithm
time approximation » one approximation, _ approximation
modified passive » modified adaptive
passive solution » positive solutions, saline solution
modified time » modified bi1, modified male

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

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