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

Try widening your search to All Fields.

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