Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"hieu cau den snippets" » "nhieu cau den snippets", "hieu cac den snippets", "hieu ca den snippets", "hieu cap den snippets", "hieu cau de snippets", "hieu hau den 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: (((("hieu cau den snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("hieu cau den snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( hieu cau den snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("hieu cau den snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.