Perhaps you should try some spelling variations:
"modified multiobjective optimization algorithm" » "modified multiobjective optimization algorithms", "modified multiobjective optimisation algorithm", "modified multiobjective estimation algorithm"
"boiler using pre algorithm" » "boiler using mppt algorithm", "boiler using qspr algorithm", "boiler using _ algorithm", "powder using pre algorithm", "boiler nursing pre algorithm", "boiler using one algorithm", "boiler using ph algorithm"

Try widening your search to All Fields.

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