Perhaps you should try some spelling variations:
canh thanh » canh tranh, danh thanh, anh thanh
thanh tuan » thanh toan, thanh xuan, thanh thanh
hien dang » thien dang, bien dang, kien dang
tuan dung » tuan duong, tran dung, tan dung
trong tap » trong thap, tong tap, trong tan
doan cau » doan dau, doan cap, doanh chau
toan cau » toan cao, toan ban, toan tap

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: "hoc hien dang - canh thanh tuan dung trong tap ((doan cau) OR (toan cau))~".
• Adding a wildcard symbol may retrieve word variants: hoc hien dang - canh thanh tuan dung trong tap ((doan cau) OR (toan cau))*.