Perhaps you should try some spelling variations:
"modified df optimisation algorithms" » "modified df optimisation algorithm", "modified df optimization algorithms", "modified df estimation algorithm", "modified _ optimisation algorithms", "modified _ optimization algorithms", "modified qoe optimization algorithms", "modified adam optimisation algorithms", "modified bi1 optimisation algorithms"
"modified objective estimation algorithms" » "modified objective estimation algorithm", "modified objective optimization algorithms", "modified objective optimisation algorithm", "modified objective allocation algorithms"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified objective estimation algorithms") OR ("modified df optimisation algorithms"))~.
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