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