Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"danh viet oi snippets" » "anh viet oi snippets", "ninh viet oi snippets", "nang viet oi snippets", "danh viet doi snippets", "danh viet voi snippets", "danh viet o 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: (((("danh viet oi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("danh viet oi snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( danh viet oi snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("danh viet oi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.