Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"nam viet do snippets" » "pham viet do snippets", "lam viec do snippets", "bac viet do snippets", "nam viet dao snippets", "nam viet doi snippets", "nam viet o 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 viet do 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 viet do snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( nam viet do snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("nam viet do snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.