Perhaps you should try some spelling variations:
estimation algorithms » estimation algorithm, optimization algorithms, optimisation algorithm
adaptive estimation » adaptive ventilation, quantile estimation, adaptive quantization
modified adaptive » modified passive
modified counting » modified caging
counting methods » nursing methods, control methods

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

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