Perhaps you should try some spelling variations:
"modified quadratic optimisation algorithm" » "modified quadratic optimization algorithm", "modified quadratic optimization algorithms", "modified quadratic estimation algorithm", "modified quadratic estimation algorithms"
"modified passive convolution algorithms" » "modified passive evolution algorithm", "modified passive solution algorithm", "modified adaptive convolution algorithms"

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