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

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