Perhaps you should try some spelling variations:
optimization algorithm » optimization algorithms, optimisation algorithm, estimation algorithm
objective optimization » multiobjective optimization
estimation algorithms » estimation algorithm, optimization algorithms, optimisation algorithm
charging estimation » charging station
modified charging » modified caging, modified carbon

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

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