Perhaps you should try some spelling variations:
"dan thuyet cac snippets" » "dien thuyet cac snippets", "nang thuyet cac snippets", "dang khuyet cac snippets", "dan thuyet xac snippets", "dan thuyet va snippets", "dan thuyet bai 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: (((("dan thuyet 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: (((("dan thuyet cac snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dan thuyet cac snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dan thuyet cac snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.