Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"nam khanh de snippets" » "nam thanh de snippets", "nam khang de snippets", "nam nhanh de snippets", "nam hanh de snippets", "nam khach deu 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 khanh de 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 khanh de snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( nam khanh de snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("nam khanh de snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.