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

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