Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"luan doi ke snippets" » "quan doi ke snippets", "lua doi ke snippets", "luan gioi ke snippets", "luan do ke snippets", "luan moi ke snippets", "luan doi de 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: (((("luan doi ke snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("luan doi ke snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( luan doi ke snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("luan doi ke snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.