Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"khoa moi den snippets" » "khoe moi den snippets", "hoa moi den snippets", "khoa doi den snippets", "khoa hoi den snippets", "khoa moi dan snippets", "khoa moi de 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 moi den 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 moi den snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( khoa moi den snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("khoa moi den snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.