Perhaps you should try some spelling variations:
trang nang » tra nang, tranh hang, thong nang
tran dang » tran quang, tran hoang, tranh hang
cua xang » chua xang, cua dang, cua hang
cong bai » cuong bai, cong hai, cung bai
bai toan » bai tap
toan ban » van ban
co cua » con cua, ca cua, cong cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: co cua xang - hanh ((trang nang) or (tran dang)) trong cong bai toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: co cua xang - hanh ((trang nang) OR (tran dang)) trong cong bai toan ban.
• Adding a wildcard symbol may retrieve word variants: co cua xang - hanh ((trang nang) or (tran dang)) trong cong bai toan ban*.