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