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