Perhaps you should try some spelling variations:
"modified multiobjective optimization algorithm" » "modified multiobjective optimization algorithms", "modified multiobjective optimisation algorithm", "modified multiobjective estimation algorithm"
"modified thermal variation algorithms" » "modified thermal estimation algorithms", "modified thermal vision algorithms", "modified thermal approximation algorithms", "modified thermal evaporation algorithms", "modified thermal activation algorithms", "modified thermal oxidation algorithms"

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• Performing a fuzzy search may retrieve terms with similar spellings: (("modified thermal variation algorithms") OR ("modified multiobjective optimization algorithm"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified thermal variation algorithms\") OR (\"modified multiobjective optimization algorithm\"))".
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