Perhaps you should try some spelling variations:
"danh thuc cach snippets" » "dan thuc cach snippets", "anh thuc cach snippets", "dinh thuc cach snippets", "danh thuoc sach snippets", "danh truoc cach snippets", "danh thuc hanh 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: (((("danh thuc cach 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 thuc cach snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( danh thuc cach snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("danh thuc cach snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.