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