Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"nam moi con snippets" » "nam moc con snippets", "nam hoi con snippets", "nam doi con snippets", "nam moi cong snippets", "nam moi co snippets", "nam mot con 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: (((("nam moi con snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("nam moi con snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( nam moi con snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("nam moi con snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.