Perhaps you should try some spelling variations:
thien thanh » tien thanh, thi thanh, hien hanh
nhung huong » nhung phuong, nhung tuong, nhung cong
hanh trung » thanh trung, hanh trang, manh trung
hieu manh » chieu xanh, hieu nganh, dieu hanh
trung dam » trung tam, trung dai, trong dam
dam nhung » cam nhung, nam nhung, dam khung
dan khan » dan khanh, dan chan, dan than
khan dam » thanh dam, chang dam, khanh nam

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thien thanh) or (hieu manh)) - hanh trung dam nhung huong dan khan dam~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thien thanh) OR (hieu manh)) - hanh trung dam nhung huong dan khan dam.
• Adding a wildcard symbol may retrieve word variants: hoc ((thien thanh) or (hieu manh)) - hanh trung dam nhung huong dan khan dam*.