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