Perhaps you should try some spelling variations:
trien quang » tran quang, tuyen quang, dien quang
thanh trung » thanh tung
khong cong » thong cong, khong cang, chong cong
thien van » thi van
trung cua » truong cua, trung tuan, trung cap
cua khong » hua khong, cua phuong, cua thuong
cong ban » cong bang, cong san, cong tan
ban than » ban thanh, van thanh, ban hang
than cap » khan cap, thanh lap, thanh cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thien van) or (trien quang)) - thanh trung cua khong cong ban than cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thien van) OR (trien quang)) - thanh trung cua khong cong ban than cap.
• Adding a wildcard symbol may retrieve word variants: hoc ((thien van) or (trien quang)) - thanh trung cua khong cong ban than cap*.