Perhaps you should try some spelling variations:
"da dung luan snippets" » "dan dung luan snippets", "dat dung luan snippets", "da dang luan snippets", "da dung quan snippets", "da dung lan snippets", "da dung luan slippers"
"using low java snippets" » "using low java slippers"
"locating bug code snippets" » "locating bug code slippers", "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (((("da dung luan snippets") OR ("using low java snippets"))) OR ("locating bug code snippets"))~.
• Removing quotes may allow a broader search: (((( da dung luan snippets ) or ( using low java snippets ))) or ( locating bug code snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("da dung luan snippets") or ("using low java snippets"))) or ("locating bug code snippets"))*.