Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"doan thi cao snippets" » "dan thi cao snippets", "doanh tai cao snippets", "hoang thi cao snippets", "doan thai cao snippets", "doan thi hao snippets", "doan thi bao 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: (((("doan thi cao snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("doan thi cao snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( doan thi cao snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("doan thi cao snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.