Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"nam sach cao snippets" » "ngan sach cao snippets", "nam danh cao snippets", "nam sao cao snippets", "nam sach dao snippets", "nam sach cap snippets", "nam mach cao 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 sach 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: (((("nam sach cao snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( nam sach cao snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("nam sach cao snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.