Perhaps you should try some spelling variations:
"_ optimization algorithms" » "_ optimisation algorithm", "_ estimation algorithms", "_ estimation algorithm"
"cost optimized algorithms" » "cost optimizer algorithms", "cost optimizer algorithmss", "most optimized algorithms"
"don optimized algorithm" » "don optimizer algorithms", "_ optimized algorithm"

Try widening your search to All Fields.

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