Perhaps you should try some spelling variations:
"modified network optimisation algorithm" » "modified network optimization algorithms", "modified network estimation algorithm", "modified network optimization algorithm", "certified network optimisation algorithm", "defined network optimisation algorithm", "modified near optimisation algorithm"
"modified allocation estimation algorithms" » "modified allocation optimization algorithms", "modified motion estimation algorithms", "modified allocation estimation algorithm", "modified allocation approximation algorithms"

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