Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"dau juan cao snippets" » "dau luan cao snippets", "dau quang cao snippets", "dan luan cao snippets", "dau toan cao snippets", "dau quan cau 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: (((("dau juan cao snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dau juan cao snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dau juan cao snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dau juan cao snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.