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

Try widening your search to All Fields.

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