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