Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van hau toc snippets" » "van ha toc snippets", "van hai toc snippets", "van dau toc snippets", "van hau loc snippets", "van phau hoc snippets", "van chau doc 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 hau 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 hau toc snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van hau toc snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van hau toc snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.