Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"chi khoa de snippets" » "nhi khoa de snippets", "chua khoa de snippets", "thai khoa de snippets", "chi khoa dr snippets", "chi khoa he snippets", "chi khoi de 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: (((("chi khoa de snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("chi khoa de snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( chi khoa de snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("chi khoa de snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.