Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"viet cao toc snippets" » "vien cao toc snippets", "viet co toc snippets", "viet ca toc snippets", "viet cac toc snippets", "viet cao hoc snippets", "viet cao ngoc 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 cao toc 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 cao toc snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( viet cao toc snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("viet cao toc snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.