Perhaps you should try some spelling variations:
"van trinh viet snippets" » "van ninh viet snippets", "van trinh vat snippets", "van thinh viet snippets", "van tinh viet snippets", "dan trinh viet snippets", "van trinh viet slippers"
"dung java java snippets" » "dung va java snippets", "dung java java slippers"
"locating bug code snippets" » "locating bug code slippers", "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

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: "((((\"dung java java snippets\") OR (\"van trinh viet snippets\"))) OR (\"locating bug code snippets\"))~".
• Removing quotes may allow a broader search: (((( dung java java snippets ) OR ( van trinh viet snippets ))) OR ( locating bug code snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("dung java java snippets") OR ("van trinh viet snippets"))) OR ("locating bug code snippets"))*.