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