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

You may be able to get more results by adjusting your search query.

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