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

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