Perhaps you should try some spelling variations:
ventilation algorithm » estimation algorithm, estimation algorithms, evolution algorithm
adaptive ventilation » adaptive quantization, invasive ventilation
modified adaptive » modified passive
machine graining » machine learning
graining methods » learning methods, learning method, making methods

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( modified adaptive ventilation algorithm ) or ( machine graining methods algorithm ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( modified adaptive ventilation algorithm ) OR ( machine graining methods algorithm )).
• Adding a wildcard symbol may retrieve word variants: (( modified adaptive ventilation algorithm ) or ( machine graining methods algorithm ))*.