Perhaps you should try some spelling variations:
trung thanh » truong thanh
thieu xanh » hieu manh, thien anh, thien danh
chieu xanh » chieu sach, chieu sang, chieu tinh
tran tuan » tran xuan, tran quang, tran thanh
dung cong » dung trong
cong tan » cong tac, cong san, cong thanh
tran cau » tran chau, toan cau, ran cau

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) OR (chieu xanh)) - thanh ((tran tuan) OR (trung thanh)) dung cong tan tran cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu xanh) OR (chieu xanh)) - thanh ((tran tuan) or (trung thanh)) dung cong tan tran cau~".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu xanh) OR (chieu xanh)) - thanh ((tran tuan) or (trung thanh)) dung cong tan tran cau*.