Perhaps you should try some spelling variations:
"allocation optimization algorithmsssss" » "allocation optimisation algorithm", "allocation optimisation algorithmssss", "allocation estimation algorithmsssss", "allocation estimation algorithmssss", "location optimization algorithmsssss"
"parameters optimization algorithms" » "parameter optimization algorithms", "parameter estimation algorithms", "parameters optimisation algorithm", "parameters estimation algorithms", "parameters estimation algorithm"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (("allocation optimization algorithmsssss") or ("parameters optimization algorithms"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("allocation optimization algorithmsssss") OR ("parameters optimization algorithms")).
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