Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"khai so toan snippets" » "hai so toan snippets", "khai mo toan snippets", "khi so toan snippets", "khai so tan snippets", "khai so than snippets", "khai bao 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: (((("khai 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: (((("khai so toan snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( khai so toan snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("khai so toan snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.