Perhaps you should try some spelling variations:
"trinh viec dat slippers" » "trinh viet dat slippers", "trinh dien dat slippers", "trinh ve dat slippers", "trinh vien dai slippers", "trinh vien da slippers", "trinh viec va slippers", "trinh viec dat slippery", "trinh viec dat grippers"
"dung java java snippets" » "dung va java snippets"
"locating bug code snippets" » "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: (((("dung java java snippets") OR ("trinh viec dat slippers"))) OR ("locating bug code snippets"))~.
• Removing quotes may allow a broader search: (((( dung java java snippets ) or ( trinh viec dat slippers ))) or ( locating bug code snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("dung java java snippets") or ("trinh viec dat slippers"))) or ("locating bug code snippets"))*.