Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"nam hon toan snippets" » "nam hop toan snippets", "nam mon toan snippets", "nam hoa toan snippets", "nam chon toan snippets", "tam hon toan snippets", "nam hoi 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 hon 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 hon toan snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( nam hon toan snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("nam hon toan snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.