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

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• Performing a fuzzy search may retrieve terms with similar spellings: (("modified invasive solution algorithm") OR ("modified multiobjective estimation algorithms"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified invasive solution algorithm\") OR (\"modified multiobjective estimation algorithms\"))*".
• Removing quotes may allow a broader search: (( modified invasive solution algorithm ) OR ( modified multiobjective estimation algorithms ))*.