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