Perhaps you should try some spelling variations:
estimation algorithms » estimation algorithm, optimization algorithms, optimisation algorithm
optimizer algorithms » optimized algorithms, optimized algorithm, optimization algorithms
invasive estimation » invasive ventilation
modified invasive » modified passive
modified game » modified male, modified adam

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 invasive estimation algorithms ) OR ( modified game optimizer algorithms ))~.
• Adding a wildcard symbol may retrieve word variants: (( modified invasive estimation algorithms ) or ( modified game optimizer algorithms ))*.