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 toan » truong toan, trung tuan, trung tran
toan khong » toan thong, toan khung, toan thuong
khong cang » thong cong, hong bang, khong dung
cang dan » cong dan, tang dan, canh dan
dan khan » dan khanh, dan chan, dan than
khan cap » khan ap, than cap, khoan cam

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 toan khong cang dan khan cap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien nhanh) OR (thien thanh)) - thanh trung toan khong cang dan khan cap".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien nhanh) OR (thien thanh)) - thanh trung toan khong cang dan khan cap*.