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

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("_ optimizer algorithms") or ("_ optimization algorithms"))) or ("risk estimation algorithms"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("_ optimizer algorithms") OR ("_ optimization algorithms"))) OR ("risk estimation algorithms")).
• Removing quotes may allow a broader search: (((( _ optimizer algorithms ) or ( _ optimization algorithms ))) or ( risk estimation algorithms )).
• Adding a wildcard symbol may retrieve word variants: (((("_ optimizer algorithms") or ("_ optimization algorithms"))) or ("risk estimation algorithms"))*.