Perhaps you should try some spelling variations:
tranh tuan » tran tuan, tranh luan, thanh tuan
tuan hoang » quan hoang, tran hoang, xuan hoang
hien xanh » hien hanh, hien nhanh, chieu xanh
vuong tac » tuong tac, vuong tat, huong tac
tac toan » tap toan, tam toan, hach toan
toan cau » toan cao, toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hien xanh - canh tranh tuan hoang vuong tac toan cau~.
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - canh tranh tuan hoang vuong tac toan cau*.