Perhaps you should try some spelling variations:
"optimisation algorithms" » "optimization algorithms", "estimation algorithm", "approximation algorithms", "optimization algorithmss", "estimation algorithms"
"optimisation algorithm" » "optimization algorithms", "estimation algorithm"
"estimation algorithms" » "estimation algorithm", "optimization algorithms", "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 (((\"optimisation algorithms\") OR (\"optimisation algorithm\"))))~".
• Removing quotes may allow a broader search: (( estimation algorithms ) OR ((( optimisation algorithms ) OR ( optimisation algorithm ))))~.
• Adding a wildcard symbol may retrieve word variants: (("estimation algorithms") OR ((("optimisation algorithms") OR ("optimisation algorithm"))))*.