Perhaps you should try some spelling variations:
"doan lieu da snippets" » "doan dieu da snippets", "dan lieu da snippets", "doanh hieu da snippets", "doan lieu dao snippets", "doan lieu dai snippets", "doan lieu dia 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"

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: (((("doan lieu da snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("doan lieu da snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( doan lieu da snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("doan lieu da snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.