Perhaps you should try some spelling variations:
trung thanh » truong thanh
thieu xanh » chieu xanh, hieu manh, thien anh
hoc thieu » toc thieu, hoc hien
tran tuan » tran xuan, tran quang, tran thanh
dung cong » dung trong
cong tan » cong tac, cong san, cong thanh
ran cau » van cau, can cau, tran chau
ban cau » bang cau, ban can, van 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 - thanh ((tran tuan) OR (trung thanh)) dung cong tan ((ran cau) OR (ban cau))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu xanh - thanh ((tran tuan) or (trung thanh)) dung cong tan ((ran cau) OR (ban cau))~".
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - thanh ((tran tuan) or (trung thanh)) dung cong tan ((ran cau) OR (ban cau))*.