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