Perhaps you should try some spelling variations:
approximation algorithm » approximation algorithms
ventilation algorithms » estimation algorithms, estimation algorithm, convolution algorithms
passive ventilation » adaptive ventilation, invasive ventilation
near approximation » one approximation, network approximation, _ approximation
modified passive » modified adaptive
modified near » modified seird, modified adam

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 passive ventilation algorithms ) OR ( modified near approximation algorithm ))~.
• Adding a wildcard symbol may retrieve word variants: (( modified passive ventilation algorithms ) or ( modified near approximation algorithm ))*.