Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"nam he cao snippets" » "nam ha cao snippets", "nam hien cao snippets", "nam nghe cao snippets", "nam he co snippets", "nam te cao snippets", "nam he cac 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 he cao 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 he cao snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( nam he cao snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("nam he cao snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.