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