Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"nam cao long snippets" » "nam cao luong snippets", "nam cao cong snippets", "nam cao dong snippets", "nam sao long snippets", "nam giao long 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: (((("nam cao long snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("nam cao long snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( nam cao long snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("nam cao long snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.