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