Perhaps you should try some spelling variations:
"danh hieu dat snippets" » "doanh hieu dat snippets", "manh hieu dat snippets", "dinh hieu dat snippets", "danh bieu dat snippets", "danh hieu bat snippets", "danh hieu dac snippets", "danh hieu dat slippers"
"dung java java snippets" » "dung va java snippets", "dung java java slippers"
"locating bug code snippets" » "locating bug code slippers", "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: (((("danh hieu dat snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("danh hieu dat snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( danh hieu dat snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("danh hieu dat snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.