Perhaps you should try some spelling variations:
ventilation algorithmss » estimation algorithms, estimation algorithm
optimization algorithm » optimization algorithms, optimisation algorithm, estimation algorithm
passive ventilation » adaptive ventilation, invasive ventilation
caging optimization » staffing optimization
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 algorithmss ) or ( modified caging optimization algorithm ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( modified passive ventilation algorithmss ) OR ( modified caging optimization algorithm )).
• Adding a wildcard symbol may retrieve word variants: (( modified passive ventilation algorithmss ) or ( modified caging optimization algorithm ))*.