Perhaps you should try some spelling variations:
"dung ung toan snippets" » "dung ung code snippets", "dung trung toan snippets", "dung quang toan snippets", "dung chung toan snippets", "dung dung toan snippets", "dung hung tran snippets", "dung hung tuan 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 ung 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 ung toan snippets") OR ("dung java java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( dung ung toan snippets ) or ( dung java java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung ung toan snippets") or ("dung java java snippets"))) or ("locating bug core snippets"))*.