Perhaps you should try some spelling variations:
thien thanh » tien thanh, thi thanh, hien hanh
hien nhanh » hien hanh, tien thanh, dien thanh
manh trung » manh tung, thanh trung, manh hung
ca thuong » cao thuong, cua thuong, va thuong
thanh cau » thanh chau, thanh mau, nhanh cau
trung ca » trung cap, truong ca, trung cua
dong van » duong van, dang van, dong va
dong von » dung von, dong co, dong hoc

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)) - manh trung ca thuong ((dong van) OR (dong von)) thanh cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien nhanh) OR (thien thanh)) - manh trung ca thuong ((dong van) OR (dong von)) thanh cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien nhanh) or (thien thanh)) - manh trung ca thuong ((dong van) OR (dong von)) thanh cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien nhanh) or (thien thanh)) - manh trung ca thuong ((dong van) OR (dong von)) thanh cau*.