Perhaps you should try some spelling variations:
thanh trinh » hanh trinh, thanh tinh, thanh binh
chieu sach » chinh sach, chiet tach, chieu xanh
chieu sang » chieu xanh, nhieu tang
trinh viet » ninh viet, trinh vat
viet chung » viet hung, viet phuong, viet thuong
chung cong » nhung cong, chong cong, phung cong
hieu lang » hieu quang, nhieu tang, hieu van
cong ban » cong bang, cong san, cong tan
ban khan » ban than, ban nhan, ban chan
khan cap » khan ap, than cap, khoan cam

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 sach) OR (((chieu sang) OR (hieu lang)))) - thanh trinh viet chung cong ban khan cap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chieu sach) or (((chieu sang) OR (hieu lang)))) - thanh trinh viet chung cong ban khan cap~".
• Adding a wildcard symbol may retrieve word variants: ho ((chieu sach) or (((chieu sang) OR (hieu lang)))) - thanh trinh viet chung cong ban khan cap*.