Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"tuan anh den snippets" » "tuan danh dien snippets", "tuan anh dong snippets", "tuan anh dung snippets", "quan anh den snippets", "tran anh den snippets", "luan anh den 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: (((("tuan anh den snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("tuan anh den snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( tuan anh den snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("tuan anh den snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.