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