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