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