Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"nghe viet de snippets" » "nghiep viet de snippets", "nghia viet de snippets", "nghe hieu de snippets", "nghe biet de snippets", "nghe viet da snippets", "nghe viet du 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: (((("nghe viet de snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("nghe viet de snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( nghe viet de snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("nghe viet de snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.