Perhaps you should try some spelling variations:
estimation algorithms » estimation algorithm, optimization algorithms, optimisation algorithm
predation algorithm » predators algorithm, estimation algorithm
invasive estimation » invasive ventilation
modified invasive » modified passive
ohca predation » orca predation
modified ohca » modified orca

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

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