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 open algorithm" » "model using mppt algorithm", "model using our algorithm", "model using driven algorithm", "code using open algorithm", "models nursing open algorithm", "powder using open algorithm", "model using opencl algorithm", "model using one algorithm"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (("modified multiobjective optimization algorithm") or ("model using open algorithm"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified multiobjective optimization algorithm") OR ("model using open algorithm")).
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