Perhaps you should try some spelling variations:
"dung cau toan snippets" » "dung cau code snippets", "dung chau toan snippets", "dung cu toan snippets", "dung cac toan snippets", "dung cuu toan snippets", "dung cau hoang snippets", "dung cau thang snippets"
"locating bug core snippets" » "locating bug code snippets"
"dung java java snippets" » "dung va java 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: (((("dung cau toan snippets") or ("dung java java snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung cau toan snippets") OR ("dung java java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( dung cau toan snippets ) or ( dung java java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung cau toan snippets") or ("dung java java snippets"))) or ("locating bug core snippets"))*.