Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"toan ket do snippets" » "toan ke do snippets", "toan kiem do snippets", "toan viet do snippets", "toan ket du snippets", "toan ket doan 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: (((("toan ket do snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("toan ket do snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( toan ket do snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("toan ket do snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.