Perhaps you should try some spelling variations:
"modified adaptive quantization algorithmss" » "modified adaptive estimation algorithms", "modified adaptive optimization algorithms", "modified adaptive ventilation algorithmss", "modified passive quantization algorithmss"
"modified allocation estimation algorithm" » "modified allocation optimization algorithm", "modified motion estimation algorithm"

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• Performing a fuzzy search may retrieve terms with similar spellings: (("modified allocation estimation algorithm") OR ("modified adaptive quantization algorithmss"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified allocation estimation algorithm\") OR (\"modified adaptive quantization algorithmss\"))*".
• Removing quotes may allow a broader search: (( modified allocation estimation algorithm ) OR ( modified adaptive quantization algorithmss ))*.