Perhaps you should try some spelling variations:
"modified quadratic optimisation algorithms" » "modified quadratic optimization algorithms", "modified quadratic estimation algorithms", "modified quadratic estimation algorithm", "modified quadratic optimization algorithmss", "modified quadratic estimation algorithmss"
"modified objective optimisation algorithm" » "modified objective optimization algorithm", "modified multiobjective optimization algorithm", "modified objective optimization algorithms", "modified objective estimation algorithm", "modified objective estimation algorithms"

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