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"
"dan than java snippets" » "dan think java snippets", "dan than va snippets", "dan chan java snippets", "ban than java snippets", "van than java snippets", "dan than java 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: (((("dan than java snippets") or ("cong dung code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dan than java snippets") OR ("cong dung code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dan than java snippets ) or ( cong dung code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dan than java snippets") or ("cong dung code snippets"))) or ("locating bug code snippets"))*.