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