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