Perhaps you should try some spelling variations:
hien nhanh » thien thanh, tien thanh, dien thanh
danh trung » dang trung, dinh trung, manh trung
hien hanh » dieu hanh
tong dan » tuong dan, thong dan, trong dan
dan chan » dan gian, dan ca, van chat
chan cau » phan cau, can cau, chinh cau
vap han » van han, va han, cap han

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 (hien hanh)) - ((danh trung) or (canh tranh)) vap han tong dan chan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien nhanh) OR (hien hanh)) - ((danh trung) OR (canh tranh)) vap han tong dan chan cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((hien nhanh) or (hien hanh)) - ((danh trung) or (canh tranh)) vap han tong dan chan cau*.