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.

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