Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"khu so toan snippets" » "khu so tan snippets", "khu so than snippets", "khu bao toan snippets", "khu do toan snippets", "khi so toan 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: (((("khu so toan snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("khu so toan snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( khu so toan snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("khu so toan snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.