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