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