Perhaps you should try some spelling variations:
"dung vinh cad snippets" » "dang vinh cad snippets", "dung ninh cad snippets", "quang vinh cad snippets", "dung trinh cad snippets", "dung tinh cao snippets", "dung dinh cac snippets"
"dung java java snippets" » "dung va java snippets"
"locating bug code snippets" » "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 vinh cad snippets\") OR (\"dung java java snippets\"))) OR (\"locating bug code snippets\"))~".
• Removing quotes may allow a broader search: (((( dung vinh cad snippets ) OR ( dung java java snippets ))) OR ( locating bug code snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("dung vinh cad snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets"))*.