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