Perhaps you should try some spelling variations:
approximation algorithm » approximation algorithms
ventilation algorithm » estimation algorithm, estimation algorithms, evolution algorithm
adaptive ventilation » adaptive quantization, invasive 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 adaptive ventilation algorithm ) OR ( modified time approximation algorithm ))~.
• Adding a wildcard symbol may retrieve word variants: (( modified adaptive ventilation algorithm ) or ( modified time approximation algorithm ))*.