Perhaps you should try some spelling variations:
objective optimization » multiobjective optimization
optimization algorithm » optimization algorithms, optimisation algorithm, estimation algorithm
solution algorithm » evolution algorithm, convolution algorithms, evolutionary algorithm
modified water » modified male
water solution » water absorption

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• The words AND, OR and NOT may confuse the search; try adding quotes: "(( modified water solution algorithm ) OR ( modified objective optimization algorithm ))~".
• Adding a wildcard symbol may retrieve word variants: (( modified water solution algorithm ) OR ( modified objective optimization algorithm ))*.