Perhaps you should try some spelling variations:
"_ optimisation algorithm" » "_ optimization algorithms", "_ estimation algorithm"
"_ estimation algorithms" » "_ estimation algorithm", "_ optimization algorithms", "_ approximation algorithms"
"doses optimized algorithms" » "doses optimized algorithm", "doses optimizer algorithms", "doses optimization algorithms", "does optimized algorithms", "dose optimized algorithms", "poses optimized algorithms"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("_ optimisation algorithm") OR ("_ estimation algorithms"))) or ("doses optimized algorithms"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("_ optimisation algorithm") OR ("_ estimation algorithms"))) OR ("doses optimized algorithms")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"_ optimisation algorithm\") OR (\"_ estimation algorithms\"))) or (\"doses optimized algorithms\"))".
• Removing quotes may allow a broader search: (((( _ optimisation algorithm ) OR ( _ estimation algorithms ))) or ( doses optimized algorithms )).
• Adding a wildcard symbol may retrieve word variants: (((("_ optimisation algorithm") OR ("_ estimation algorithms"))) or ("doses optimized algorithms"))*.