Perhaps you should try some spelling variations:
thanh tung » thanh cong
hoc chiet » hoc nhiet, hoc hien, hoc viet
hoc thiet » hoc thieu, hoc thuyet, hoc hien
dat quang » dau quang, chat quang, dang quang
tung dat » dung dat, vung dat, tung dan
cong ban » cong bang, cong tan, cong dan
cong san » cong tac
than cap » khan cap, thanh lap, thanh cac

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: ((hoc chiet) OR (hoc thiet)) tach - thanh tung dat quang ((cong ban) OR (cong san)) than cap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc chiet) or (hoc thiet)) tach - thanh tung dat quang ((cong ban) OR (cong san)) than cap~".
• Adding a wildcard symbol may retrieve word variants: ((hoc chiet) or (hoc thiet)) tach - thanh tung dat quang ((cong ban) OR (cong san)) than cap*.