Perhaps you should try some spelling variations:
thien thanh » tien thanh, thi thanh, hien hanh
thanh trung » thanh tung
thien hach » hien hanh
trung cua » truong cua, trung tuan, trung cap
dung cong » dung trong
thanh cac » hanh cac, thanh bac, thanh ca
nhanh cau » nhanh cay, thanh chau, nhanh ha
cua dung » cua dang, cua dong, qua dung
cong tac » cong ty

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thien hach) OR (thien thanh)) - thanh trung cua dung cong tac ((thanh cac) or (nhanh cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thien hach) OR (thien thanh)) - thanh trung cua dung cong tac ((thanh cac) OR (nhanh cau)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thien hach) OR (thien thanh)) - thanh trung cua dung cong tac ((thanh cac) or (nhanh cau))".
• Adding a wildcard symbol may retrieve word variants: hoc ((thien hach) OR (thien thanh)) - thanh trung cua dung cong tac ((thanh cac) or (nhanh cau))*.