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

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 time approximation algorithm ) OR ( modified adaptive convolution algorithms ))~.
• Adding a wildcard symbol may retrieve word variants: (( modified time approximation algorithm ) or ( modified adaptive convolution algorithms ))*.