Perhaps you should try some spelling variations:
trung thuan » trung tuan, trong thuan, trong thuat
trung thanh » truong thanh
chieu sang » chieu sach, chieu xanh, hieu lang
thanh cac » hanh cac, thanh bac, thanh ca
ho chieu » theo chieu, hoc thieu, doi chieu
cong san » cong tac
than cap » khan cap, thanh lap, than cua

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: ho chieu sang - thanh ((trung thuan) OR (trung thanh)) trong cong san ((than cap) OR (thanh cac))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chieu sang - thanh ((trung thuan) OR (trung thanh)) trong cong san ((than cap) or (thanh cac))~".
• Adding a wildcard symbol may retrieve word variants: ho chieu sang - thanh ((trung thuan) OR (trung thanh)) trong cong san ((than cap) or (thanh cac))*.