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