Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"luc duc toan snippets" » "luc duc tan snippets", "luc duc ton snippets", "luc duc hoan snippets", "luc du toan snippets", "luu duc toan snippets", "luc dich 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: (((("luc duc 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: (((("luc duc toan snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( luc duc toan snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("luc duc toan snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.