Perhaps you should try some spelling variations:
estimation algorithmss » estimation algorithms, estimation algorithm, optimization algorithms
ventilation algorithm » estimation algorithm, estimation algorithms, evolution algorithm
invasive ventilation » adaptive ventilation
modified invasive » modified passive
modified pose » modified male, modified passive

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

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