Perhaps you should try some spelling variations:
truong toan » truong ton, trong toan, truong tan
hien nhanh » hien hanh, thien thanh, tien thanh
trung toan » trung tuan, trung tran, trong toan
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 - thanh ((trung toan) OR (truong toan)) khong cang dan ((khan cap) or (khoan cam))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien nhanh - thanh ((trung toan) OR (truong toan)) khong cang dan ((khan cap) OR (khoan cam)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien nhanh - thanh ((trung toan) OR (truong toan)) khong cang dan ((khan cap) or (khoan cam))".
• Adding a wildcard symbol may retrieve word variants: hoc hien nhanh - thanh ((trung toan) OR (truong toan)) khong cang dan ((khan cap) or (khoan cam))*.