Perhaps you should try some spelling variations:
optimization algorithm » optimization algorithms, optimisation algorithm, estimation algorithms
location optimization » allocation optimization, static optimization
modified location » modified carbon
df estimation » _ estimation
modified df » modified _, modified adam, modified bi1

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

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