Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sang » chieu sach, chieu xanh, hieu lang
chiet tach » chieu sach
trung cua » truong cua, trung tuan, trung cap
trai chau » tran chau, trai chan, tra chat
van cong » van dong, van phong, phan cong
cong tac » cong ty
cua van » cua ban, cua vat, cua dan

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((chieu sang) or (chiet tach)) - thanh trung cua van cong tac ((trai chau) OR (lai chau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu sang) OR (chiet tach)) - thanh trung cua van cong tac ((trai chau) OR (lai chau)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chieu sang) or (chiet tach)) - thanh trung cua van cong tac ((trai chau) OR (lai chau))".
• Adding a wildcard symbol may retrieve word variants: ho ((chieu sang) or (chiet tach)) - thanh trung cua van cong tac ((trai chau) OR (lai chau))*.