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

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified invasive estimation algorithm\") OR (\"modified network optimization algorithms\"))~".
• Removing quotes may allow a broader search: (( modified invasive estimation algorithm ) OR ( modified network optimization algorithms ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified invasive estimation algorithm") OR ("modified network optimization algorithms"))*.