Perhaps you should try some spelling variations:
"optimization algorithmss" » "optimisation algorithm", "estimation algorithm", "optimized algorithms", "optimisation algorithms", "estimation algorithms", "optimized algorithmss"
"optimization algorithms" » "optimisation algorithm", "estimation algorithm", "optimized algorithms"
"estimation algorithms" » "estimation algorithm", "optimisation algorithm", "approximation algorithms"

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: "((\"estimation algorithms\") OR (((\"optimization algorithmss\") OR (\"optimization algorithms\"))))~".
• Removing quotes may allow a broader search: (( estimation algorithms ) OR ((( optimization algorithmss ) OR ( optimization algorithms ))))~.
• Adding a wildcard symbol may retrieve word variants: (("estimation algorithms") OR ((("optimization algorithmss") OR ("optimization algorithms"))))*.