Perhaps you should try some spelling variations:
estimation algorithms » estimation algorithm, optimization algorithms, optimisation algorithm
source algorithm » our algorithm, search algorithm
df estimation » _ estimation
using source » using force, using morse
modified df » modified _, modified adam, modified bi1
code » core

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

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