Perhaps you should try some spelling variations:
"modified multiobjective optimization algorithm" » "modified multiobjective optimization algorithms", "modified multiobjective optimisation algorithm", "modified multiobjective estimation algorithm"
"powder using source algorithm" » "powder using our algorithm", "powder using search algorithm", "code using source algorithm", "boiler using source algorithm", "model using source algorithm", "powder using force algorithm", "powder using morse algorithm"

Try widening your search to All Fields.

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