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