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
bi1 approximation » time approximation, _ approximation, one approximation
modified adaptive » modified passive
modified bi1 » modified _

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 bi1 approximation algorithm ) OR ( modified adaptive ventilation algorithm ))~.
• Adding a wildcard symbol may retrieve word variants: (( modified bi1 approximation algorithm ) or ( modified adaptive ventilation algorithm ))*.