Perhaps you should try some spelling variations:
approximations algorithms » approximation algorithms, approximation algorithm
rough approximations » one approximation
solution algorithm » evolution algorithm, convolution algorithms, evolutionary algorithm
modified saline » modified caging, modified male, modified passive

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