Perhaps you should try some spelling variations:
"modified network optimisation algorithm" » "modified network optimization algorithms", "modified network estimation algorithms", "modified network optimization algorithm", "certified network optimisation algorithm", "defined network optimisation algorithm", "modified near optimisation algorithm"
"modified invasive estimation algorithm" » "modified invasive ventilation algorithm", "modified passive estimation algorithm"

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified invasive estimation algorithm\") OR (\"modified network optimisation algorithm\"))~".
• Removing quotes may allow a broader search: (( modified invasive estimation algorithm ) OR ( modified network optimisation algorithm ))~.
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