Perhaps you should try some spelling variations:
"_ estimation algorithms" » "_ estimation algorithm", "_ optimization algorithms", "_ optimisation algorithm"
"dong optimizer algorithms" » "dong optimized algorithm", "dong optimization algorithms", "cong optimizer algorithms", "dung 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: (((("dong optimizer algorithms") or ("post optimized algorithms"))) or ("_ estimation algorithms"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dong optimizer algorithms") OR ("post optimized algorithms"))) OR ("_ estimation algorithms")).
• Removing quotes may allow a broader search: (((( dong optimizer algorithms ) or ( post optimized algorithms ))) or ( _ estimation algorithms )).
• Adding a wildcard symbol may retrieve word variants: (((("dong optimizer algorithms") or ("post optimized algorithms"))) or ("_ estimation algorithms"))*.