Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"khoi he hoc snippets" » "khoa he hoc snippets", "khoi de hoc snippets", "khong he hoc snippets", "khoi te hoc snippets", "khoi he ho 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: (((("khoi he 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: (((("khoi he hoc snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( khoi he hoc snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("khoi he hoc snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.