Perhaps you should try some spelling variations:
estimation algorithms » estimation algorithm, optimization algorithms, optimisation algorithm
df estimation » _ estimation
pre algorithm » mppt algorithm, qspr algorithm, _ algorithm
modified df » modified _, modified adam, modified bi1
using pre » nursing pre, using one, using ph

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

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