Perhaps you should try some spelling variations:
"dung lieu da snippets" » "dung hieu da snippets", "dung tieu da snippets", "dung viet da snippets", "dung lieu dao snippets", "dung lieu dai snippets", "dung lieu dia snippets"
"using a code snippets" » "using a core snippets"
"locating bug code snippets" » "locating bug core 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: (((("using a code snippets") or ("dung lieu da snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("using a code snippets") OR ("dung lieu da snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( using a code snippets ) or ( dung lieu da snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("using a code snippets") or ("dung lieu da snippets"))) or ("locating bug code snippets"))*.