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

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "(( modified near approximation algorithm ) OR ( modified invasive ventilation algorithms ))~".
• Adding a wildcard symbol may retrieve word variants: (( modified near approximation algorithm ) OR ( modified invasive ventilation algorithms ))*.