Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van tan toc snippets" » "van tuan toc snippets", "van ban toc snippets", "van tai toc snippets", "van dan toc snippets", "van tan duoc snippets", "van thac 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: (((("van tan 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: (((("van tan toc snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van tan toc snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van tan toc snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.