Perhaps you should try some spelling variations:
"modified load optimization algorithms" » "modified load optimisation algorithm", "modified load estimation algorithms", "modified load estimation algorithm", "modified global optimization algorithms", "modified qoe optimization algorithms", "modified stage optimization algorithms", "modified adam optimization algorithms", "modified near optimization algorithms"
"modified notion approximation algorithms" » "modified network approximation algorithms", "modified time approximation algorithms", "modified one approximation algorithms"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified load optimization algorithms") OR ("modified notion approximation algorithms"))~.
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