Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"ket doan ve snippets" » "ket hoa ve snippets", "le doan ve snippets", "ket van ve snippets", "ket doan va snippets", "ket doan vi snippets", "ket toan ve 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 doan ve 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 doan ve snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( ket doan ve snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("ket doan ve snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.