Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets", "python using java slippers"
"don den tuan snippets" » "don den tran snippets", "don den thanh snippets", "don doan tuan snippets", "don dien tuan snippets", "dan den tuan snippets", "don dep tuan snippets", "don den tuan slippers"
"locating bug code snippets" » "locating bug code slippers", "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: (((("don den tuan snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("don den tuan snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( don den tuan snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("don den tuan snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.