Perhaps you should try some spelling variations:
"cong dung code snippets" » "cuong dung code snippets", "cong dong code snippets", "cong luong code snippets", "cong dung cong snippets", "cong dung co snippets", "cong dung de snippets", "cong dung code slippers"
"tang van code snippets" » "dang van code snippets", "hoang van code snippets", "trong van code snippets", "tang van de snippets", "tang van hoe snippets", "tang van cong snippets", "tang van code slippers"
"locating bug code snippets" » "locating bug code slippers", "locating bung code snippets", "locating bugs code snippets"

Try widening your search to All Fields.

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

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