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

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