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