Perhaps you should try some spelling variations:
"cong toan chi snippets" » "cong tan chi snippets", "cong hoan chi snippets", "cong tuan chi snippets", "cong toan cao snippets", "cong tai chi snippets", "cong luan chi snippets"
"dung java java snippets" » "dung va java 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: (((("cong toan chi snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("cong toan chi snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( cong toan chi snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("cong toan chi snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.