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