Perhaps you should try some spelling variations:
optimization algorithmss » optimization algorithms, optimisation algorithm, estimation algorithm
objective optimization » multiobjective optimization
estimation algorithms » estimation algorithm, optimization algorithms, optimisation algorithm
network estimation » network optimization

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

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