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

Try widening your search to All Fields.

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