Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
hanh tranh » canh tranh, hanh trinh, hanh trang
hoc thieu » toc thieu, hoc hien
tranh va » tranh van, trang va, trinh va
tong tap » tuong tac, trong tan, cong tac
cong tan » cong tac, cong san, cong thanh
toan tap » toan ban

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: hoc thieu xanh - hanh tranh va nhung ((tong tap) OR (cong tan)) toan tap~.
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - hanh tranh va nhung ((tong tap) or (cong tan)) toan tap*.