Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"pham tuan co snippets" » "pham luan co snippets", "pham xuan co snippets", "pham thanh co snippets", "pham toan co snippets", "pham quan co snippets", "pham tuan cu 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: (((("pham tuan co snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("pham tuan co snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( pham tuan co snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("pham tuan co snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.