Perhaps you should try some spelling variations:
thien thanh » tien thanh, thi thanh, hien hanh
thanh trung » thanh tung
hien nhanh » hien hanh, tien thanh, dien thanh
trung tuan » trung thanh, trung tam, tran tuan
tuan khong » toan khong, tuan phong, thuan phong
khong cang » thong cong, hong bang, khong dung
khoan cam » khoa cam, khoan va, phan cam
cang dan » cong dan, tang dan, canh dan
khan cap » khan ap, than cap, phan cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hien nhanh) OR (thien thanh)) - thanh trung tuan khong cang dan ((khan cap) or (khoan cam))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien nhanh) OR (thien thanh)) - thanh trung tuan khong cang dan ((khan cap) OR (khoan cam)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien nhanh) OR (thien thanh)) - thanh trung tuan khong cang dan ((khan cap) or (khoan cam))".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien nhanh) OR (thien thanh)) - thanh trung tuan khong cang dan ((khan cap) or (khoan cam))*.