Perhaps you should try some spelling variations:
thanh trung » thanh tung
hoc thiet » hoc thieu, hoc thuyet, hoc hien
trung cua » truong cua, trung tuan, trung cap
ho thiet » hoa thiet, so thiet, hoc thieu
cua tong » cua cong, cua dong, cua nong
cong dan » cong san, huong dan, cong dong
cong tan » cong tac, cong san, cong thanh
phan cau » phan dau, phan cac, phan tu

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 thiet) OR (hoc thiet)) tach - thanh trung cua tong ((cong dan) OR (cong tan)) phan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho thiet) OR (hoc thiet)) tach - thanh trung cua tong ((cong dan) or (cong tan)) phan cau~".
• Adding a wildcard symbol may retrieve word variants: ((ho thiet) OR (hoc thiet)) tach - thanh trung cua tong ((cong dan) or (cong tan)) phan cau*.