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