Perhaps you should try some spelling variations:
"dong optimizer algorithmss" » "dong optimizer algorithms", "dong optimized algorithms", "cong optimizer algorithmss", "dung optimizer algorithmss"
"_ estimation algorithms" » "_ estimation algorithm", "_ optimization algorithms", "_ optimisation algorithm"
"dong optimized algorithm" » "dong optimized algorithms", "dong optimizer algorithms", "cong optimized algorithm", "dung optimized algorithm"

Try widening your search to All Fields.

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