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