Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, hieu manh
hien nhanh » hien hanh, thien thanh, tien thanh
thong cong » trong cong, tong cong, thong thong
bang luan » tang luan, dung luan, tong luan
hang luan » tang luan, dung luan
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than ban » thanh ban, toan ban, than man

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 nganh) OR (hien nhanh)) - anh ((bang luan) OR (hang luan)) thong cong dan than ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hieu nganh) or (hien nhanh)) - anh ((bang luan) OR (hang luan)) thong cong dan than ban~".
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu nganh) or (hien nhanh)) - anh ((bang luan) OR (hang luan)) thong cong dan than ban*.