Perhaps you should try some spelling variations:
ventilation algorithms » estimation algorithms, estimation algorithm, convolution algorithms
passive ventilation » adaptive ventilation, invasive ventilation
solution algorithm » evolution algorithm, convolution algorithms, evolutionary algorithm
modified learning » mobile learning, modified caging
learning solution » learning convolution, learning emotion
modified passive » modified adaptive

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

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