Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van cong toc snippets" » "van dong toc snippets", "van phong toc snippets", "phan cong toc snippets", "van cong tac snippets", "van cong coc snippets", "van cong uoc 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 cong 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 cong toc snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van cong toc snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van cong toc snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.