Perhaps you should try some spelling variations:
"modified objective approximation algorithm" » "modified objective approximation algorithms"
"modified allocation estimation algorithmss" » "modified allocation estimation algorithms", "modified allocation estimation algorithm", "modified allocation optimization algorithms", "modified allocation optimization algorithmss", "modified motion estimation algorithmss"

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• Performing a fuzzy search may retrieve terms with similar spellings: (("modified allocation estimation algorithmss") OR ("modified objective approximation algorithm"))~.
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