Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"sach nam cac snippets" » "sach nay cac snippets", "sach tham cac snippets", "sach nang cac snippets", "sach nam cao snippets", "sach nam sach 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: (((("sach nam cac snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("sach nam cac snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( sach nam cac snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("sach nam cac snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.