Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"viet dan hoc snippets" » "viet van hoc snippets", "viet da hoc snippets", "viet dao hoc snippets", "viet dan toc snippets", "viet dai hoc 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 dan hoc 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 dan hoc snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( viet dan hoc snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("viet dan hoc snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.