Perhaps you should try some spelling variations:
"_ optimisation algorithm" » "_ optimization algorithms", "_ optimization algorithm"
"_ estimation algorithms" » "_ optimization algorithms", "_ approximation algorithms"
"post estimation algorithm" » "pose estimation algorithm", "risk estimation algorithm", "pulses estimation algorithm"

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: (((("post estimation algorithm") OR ("_ optimisation algorithm"))) OR ("_ estimation algorithms"))~.
• Removing quotes may allow a broader search: (((( post estimation algorithm ) or ( _ optimisation algorithm ))) or ( _ estimation algorithms ))~.
• Adding a wildcard symbol may retrieve word variants: (((("post estimation algorithm") or ("_ optimisation algorithm"))) or ("_ estimation algorithms"))*.