Perhaps you should try some spelling variations:
"modified multiobjective optimization algorithms" » "modified multiobjective optimisation algorithm", "modified multiobjective estimation algorithms", "modified multiobjective estimation algorithm"
"modified exact solution algorithms" » "modified exact solution algorithm", "modified exact evolution algorithm", "modified exact convolution algorithms", "modified nacl solution algorithms"

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified exact solution algorithms\") OR (\"modified multiobjective optimization algorithms\"))~".
• Removing quotes may allow a broader search: (( modified exact solution algorithms ) OR ( modified multiobjective optimization algorithms ))~.
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