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

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

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