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

Try widening your search to All Fields.

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