Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"khoa viet de snippets" » "khoan viet de snippets", "hoa viet de snippets", "thoai viet de snippets", "khoa biet de snippets", "khoa viet da snippets", "khoa viet du 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: (((("khoa viet 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: (((("khoa viet de snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( khoa viet de snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("khoa viet de snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.