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