Perhaps you should try some spelling variations:
"using computational methods clustering problem" » "using computational model clustering problem" (Expand search), "and computational methods clustering problem" (Expand search), "using computational medoids clustering problem" (Expand search), "using computational methods cluster problem" (Expand search), "using computational networks clustering problem" (Expand search), "using computational methods covering problem" (Expand search)
"using combination and coding program" » "business combination and coding program" (Expand search), "drug combination and coding program" (Expand search), "and combination and coding program" (Expand search), "using combination in coding program" (Expand search), "using combination of coding program" (Expand search), "using combination _ coding program" (Expand search), "using combination and cloning program" (Expand search), "using combination and loading program" (Expand search), "using combination and cooling programs" (Expand search), "using combination and coping program" (Expand search), "using combination and cooling program" (Expand search), "using combination and cooking program" (Expand search)

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"using computational methods clustering problem\") OR (\"using combination and coding program\"))~".
• Removing quotes may allow a broader search: (( using computational methods clustering problem ) OR ( using combination and coding program ))~.
• Adding a wildcard symbol may retrieve word variants: (("using computational methods clustering problem") OR ("using combination and coding program"))*.