Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"pham sach de snippets" » "pham anh de snippets", "nam sach de snippets", "pham hanh de snippets", "pham cach de snippets", "pham sach dao snippets", "pham sach dat 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 sach 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: (((("pham sach de snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( pham sach de snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("pham sach de snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.