Perhaps you should try some spelling variations:
hien manh » tien manh, hieu manh, hien nhanh
hien hanh » dieu hanh
hanh tang » hanh trang, anh tang, hanh mang
tang luan » dung luan
luan hang » luan nang, luan han, luan hung
hang cong » dang cong, hang nong, bang cong
dan chan » dan gian, dan ca, van chat

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

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien manh) OR (hien hanh)) - hanh tang luan hang cong ((xuan toan) OR (dan chan)) ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien manh) OR (hien hanh)) - hanh tang luan hang cong ((xuan toan) or (dan chan)) ban~".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien manh) OR (hien hanh)) - hanh tang luan hang cong ((xuan toan) or (dan chan)) ban*.