Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sang » chieu sach, chieu xanh, nhieu tang
hieu lang » hieu quang, nhieu tang, hieu van
trung qua » trung quan, trong qua, trung cua
qua trong » quan trong, qua trinh, qua song
thanh cac » hanh cac, thanh bac, thanh ca
cong tac » cong ty
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: theo ((chieu sang) OR (hieu lang)) - thanh trung qua trong cong tac ((than cap) OR (thanh cac))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chieu sang) OR (hieu lang)) - thanh trung qua trong cong tac ((than cap) or (thanh cac))~".
• Adding a wildcard symbol may retrieve word variants: theo ((chieu sang) OR (hieu lang)) - thanh trung qua trong cong tac ((than cap) or (thanh cac))*.