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