Perhaps you should try some spelling variations:
"modified multiobjective optimisation algorithm" » "modified multiobjective optimization algorithm", "modified objective optimization algorithm", "modified multiobjective optimization algorithms", "modified multiobjective estimation algorithm", "modified multiobjective estimation algorithms"
"modified df solution algorithms" » "modified df solution algorithm", "modified df evolution algorithm", "modified df convolution algorithms", "modified _ solution algorithms", "modified adam solution algorithms", "modified bi1 solution algorithms", "modified drug solution algorithms", "modified up solutions algorithms"

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