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