Perhaps you should try some spelling variations:
estimation algorithms » estimation algorithm, optimization algorithms, optimisation algorithm
method algorithm » mom algorithm
df estimation » _ estimation
using method » nursing methods, focusing method, using metal
modified df » modified _, modified adam, modified bi1
code » core

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "(( code using method algorithm ) OR ( modified df estimation algorithms ))~".
• Adding a wildcard symbol may retrieve word variants: (( code using method algorithm ) OR ( modified df estimation algorithms ))*.