Perhaps you should try some spelling variations:
"dung viet some snippets" » "nang viet some snippets", "cong viet some snippets", "mang viet some snippets", "dung viet song snippets"
"van minh code snippets" » "van minh cong snippets", "van minh de snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("dung viet some snippets") or ("van minh code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung viet some snippets") OR ("van minh code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung viet some snippets ) or ( van minh code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung viet some snippets") or ("van minh code snippets"))) or ("locating bug code snippets"))*.