Perhaps you should try some spelling variations:
trong nghe » cong nghe, trong nha, trong he
trong nghi » trong nha, trong thi
thong cong » trong cong, tong cong, thong thong
hien hanh » dieu hanh
cong danh » cuong danh, cong dan, cong thanh
toan cau » toan cao, toan ban, toan tai
toan tap » toan ban

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 hanh - lang ((trong nghe) OR (trong nghi)) thong cong danh ((toan cau) OR (toan tap))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien hanh - lang ((trong nghe) OR (trong nghi)) thong cong danh ((toan cau) or (toan tap))~".
• Adding a wildcard symbol may retrieve word variants: hoc hien hanh - lang ((trong nghe) OR (trong nghi)) thong cong danh ((toan cau) or (toan tap))*.