Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"nam van coc snippets" » "nam dan coc snippets", "nam va coc snippets", "pham van coc snippets", "nam van hoc snippets", "nam van loc snippets", "nam van co 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 van coc 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 van coc snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( nam van coc snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("nam van coc snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.