Perhaps you should try some spelling variations:
multiobjective estimation » multiobjective optimization
estimation algorithms » estimation algorithm, optimization algorithms, optimisation algorithm
research algorithm » search algorithm
based research » asia research, care research
code based » model based, coal based, income based

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

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