Perhaps you should try some spelling variations:
"dung dung code snippets" » "duong dung code snippets", "ung dung code snippets", "dung ung code snippets", "dung dung cong snippets", "dung dung co snippets", "dung dung de snippets"
"dung tran doan snippets" » "dung tren doan snippets", "hung tran doan snippets", "dang tran doan snippets", "dung trang doan snippets", "dung tan doan snippets", "dung tran hoan snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets"

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"dung dung code snippets\") OR (\"dung tran doan snippets\"))) OR (\"locating bug code snippets\"))~".
• Removing quotes may allow a broader search: (((( dung dung code snippets ) OR ( dung tran doan snippets ))) OR ( locating bug code snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("dung dung code snippets") OR ("dung tran doan snippets"))) OR ("locating bug code snippets"))*.