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