Perhaps you should try some spelling variations:
"modified objective optimization algorithm" » "modified objective optimization algorithms", "modified objective optimisation algorithm", "modified objective estimation algorithm", "modified multiobjective optimization algorithm"
"modified minimal solution algorithms" » "modified minimal solution algorithm", "modified minimal evolution algorithm", "modified minimal convolution algorithms", "modified thermal solution algorithms", "modified optimal solution algorithms", "modified nodal solution algorithms"

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified minimal solution algorithms\") OR (\"modified objective optimization algorithm\"))~".
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