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
nong cong » cong cong, tong cong, nang cong
hoc hiem » hoc hien, hoc thieu, hoc nhiet
cua nong » cua cong, cuu nong, cua dong
cong dan » cong san, cong tan, huong dan
than cau » toan cau, phan cau, thanh chau
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 hiem) OR (hoc thiet)) ngan - thanh trung cua nong cong dan ((than cau) OR (than cap))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc hiem) OR (hoc thiet)) ngan - thanh trung cua nong cong dan ((than cau) or (than cap))~".
• Adding a wildcard symbol may retrieve word variants: ((hoc hiem) OR (hoc thiet)) ngan - thanh trung cua nong cong dan ((than cau) or (than cap))*.