Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"dau luan du snippets" » "dan luan du snippets", "dat luan du snippets", "khau luan du snippets", "dau xuan du snippets", "dau luat du snippets", "dau luan de 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: (((("dau luan du snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dau luan du snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dau luan du snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dau luan du snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.