Perhaps you should try some spelling variations:
cach thuong » mach thuong, sach thuong, cac truong
hieu manh » chieu xanh, hieu nganh, dieu hanh
thien anh » thien danh, tien anh, thien thanh
than tinh » thanh tinh, than kinh, thai tinh
cong dan » cong san, huong dan, cong dong
cong tan » cong tac, cong san, cong thanh
than tap » toan tap, han tap, phan tap

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 ((hieu manh) OR (thien anh)) - than tinh cach thuong ((cong dan) OR (cong tan)) than tap~.
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu manh) or (thien anh)) - than tinh cach thuong ((cong dan) or (cong tan)) than tap*.