Perhaps you should try some spelling variations:
thanh trung » thanh tung
trinh quan » tinh quang, trinh luat, trinh han
trinh toan » tinh toan, thanh toan, trinh han
hieu lang » chieu sang, hieu quang, nhieu tang
trung cua » truong cua, trung tuan, trung cap
dong cong » duong cong, dung cong, dang cong
cua dong » chua dong, cua cong, cua dang
ho hieu » ho chieu, hoi hieu, nho hieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho hieu lang - thanh trung cua dong cong ((trinh quan) or (trinh toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu lang - thanh trung cua dong cong ((trinh quan) OR (trinh toan)) cau.
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - thanh trung cua dong cong ((trinh quan) or (trinh toan)) cau*.