Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"viet goc cao snippets" » "viet duc cao snippets", "viet o cao snippets", "viet co cao snippets", "viet hoc cao snippets", "viet toc cao snippets", "viet doc 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: (((("viet goc 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: (((("viet goc cao snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( viet goc cao snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("viet goc cao snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.