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

Try widening your search to All Fields.

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