Perhaps you should try some spelling variations:
"modified location optimization algorithms" » "modified location optimisation algorithm", "modified location estimation algorithm", "modified location optimized algorithms", "modified allocation optimization algorithms", "modified static optimization algorithms", "modified carbon optimization algorithms"
"modified notion estimation algorithms" » "modified notion estimation algorithm", "modified notion optimisation algorithm", "modified notion approximation algorithms", "modified motion estimation algorithms"

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