Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"sach viet da snippets" » "bach viet da snippets", "cach viet da snippets", "anh viet da snippets", "sach viet dao snippets", "sach viet dat snippets", "sach viet ha 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 viet da 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 viet da snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( sach viet da snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("sach viet da snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.