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