Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"cao sach toc snippets" » "co sach toc snippets", "ao sach toc snippets", "cau sach toc snippets", "cao bach tuoc snippets", "cao sach duoc snippets", "cao sach nuoc 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: (((("cao sach toc snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("cao sach toc snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( cao sach toc snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("cao sach toc snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.