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