Perhaps you should try some spelling variations:
"and computational methods clustering problem" » "and computational model clustering problem" (Expand search), "and computational medoids clustering problem" (Expand search), "and computational methods cluster problem" (Expand search), "and computational networks clustering problem" (Expand search), "and computational methods covering problem" (Expand search), "_ computational methods clustering problem" (Expand search)
"using implication in coding program" » "using implications in coding program" (Expand search), "using application in coding program" (Expand search), "nursing implications in coding program" (Expand search), "using implications on coding program" (Expand search), "using implication of coding program" (Expand search), "using implication in cloning program" (Expand search), "using implication in loading program" (Expand search), "using implication in cooling programs" (Expand search), "using implication on coding program" (Expand search), "using implication in decoding program" (Expand search), "using implication non coding program" (Expand search)

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"and computational methods clustering problem\") OR (\"using implication in coding program\"))~".
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