Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"ket nam cac snippets" » "det nam cac snippets", "ket nap cac snippets", "viet nam cac snippets", "ket nam cao snippets", "ket 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: (((("ket 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: (((("ket nam cac snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( ket nam cac snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("ket nam cac snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.