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

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