Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"nam do toan snippets" » "nam do tuan snippets", "nam so toan snippets", "nam bao toan snippets", "nam dao toan snippets", "nam doi toan snippets", "nam bo toan 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 do toan 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 do toan snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( nam do toan snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("nam do toan snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.