Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"khoi van toi snippets" » "khoi can toi snippets", "khoi va toi snippets", "thoai van toi snippets", "khoi van tai snippets", "khoi van thi snippets", "khoi van toan 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: (((("khoi van toi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("khoi van toi snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( khoi van toi snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("khoi van toi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.