Perhaps you should try some spelling variations:
"modified allocation optimisation algorithms" » "modified allocation optimization algorithms", "modified allocation estimation algorithms", "modified allocation estimation algorithm", "modified allocation optimization algorithmss", "modified allocation estimation algorithmss"
"modified _ optimisation algorithm" » "modified _ optimization algorithms", "modified _ estimation algorithm", "modified _ estimation algorithms"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified allocation optimisation algorithms") OR ("modified _ optimisation algorithm"))~.
• Removing quotes may allow a broader search: (( modified allocation optimisation algorithms ) or ( modified _ optimisation algorithm ))~.
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