Perhaps you should try some spelling variations:
"dung luan code snippets" » "dung luan cong snippets", "dung luan che snippets", "dung luan de snippets", "dung luan code slippers"
"tran dung code snippets" » "tran dang code snippets", "tran hung code snippets", "tran quang code snippets", "tran dung cong snippets", "tran dung co snippets", "tran dung de snippets", "tran dung code slippers"
"locating bug code snippets" » "locating bug code slippers", "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 luan code snippets\") OR (\"tran dung code snippets\"))) OR (\"locating bug code snippets\"))~".
• Removing quotes may allow a broader search: (((( dung luan code snippets ) OR ( tran dung code snippets ))) OR ( locating bug code snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("dung luan code snippets") OR ("tran dung code snippets"))) OR ("locating bug code snippets"))*.