Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"sach ke ton snippets" » "sach kem ton snippets", "sach de ton snippets", "sach che ton snippets", "sach ke toan snippets", "sach ke don 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: (((("sach ke ton snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("sach ke ton snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( sach ke ton snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("sach ke ton snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.