Perhaps you should try some spelling variations:
"modified allocation optimization algorithms" » "modified allocation optimisation algorithm", "modified allocation estimation algorithms", "modified allocation optimized algorithms", "modified location optimization algorithms"
"modified stochastic estimation algorithm" » "modified stochastic optimization algorithm"

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• Performing a fuzzy search may retrieve terms with similar spellings: (("modified stochastic estimation algorithm") or ("modified allocation optimization algorithms"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified stochastic estimation algorithm") OR ("modified allocation optimization algorithms"))*.
• Removing quotes may allow a broader search: (( modified stochastic estimation algorithm ) or ( modified allocation optimization algorithms ))*.