Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"viet van da snippets" » "viet nam da snippets", "viet anh da snippets", "viet ha da snippets", "viet van dao snippets", "viet van dau snippets", "viet van dan 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: (((("viet van da snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("viet van da snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( viet van da snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("viet van da snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.