Perhaps you should try some spelling variations:
"danh hieu van snippets" » "doanh hieu van snippets", "manh hieu van snippets", "dinh hieu van snippets", "danh hieu va snippets", "danh thien van snippets", "danh lieu va snippets", "danh hieu van 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 van 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 van snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( danh hieu van snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("danh hieu van snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.