Perhaps you should try some spelling variations:
"modified multiobjective optimization algorithms" » "modified multiobjective optimisation algorithm", "modified multiobjective estimation algorithms", "modified multiobjective estimation algorithm"
"modified qoe approximation algorithms" » "modified one approximation algorithms", "modified time approximation algorithms", "modified _ approximation algorithms", "modified male approximation algorithms", "modified bi1 approximation algorithms"

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified qoe approximation algorithms\") OR (\"modified multiobjective optimization algorithms\"))~".
• Removing quotes may allow a broader search: (( modified qoe approximation algorithms ) OR ( modified multiobjective optimization algorithms ))~.
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