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