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