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

Try widening your search to All Fields.

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