Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, nhung don
theo dieu » theo tieu, theo chieu, thuoc dieu
hanh tang » hanh trang, anh tang, hanh mang
hang cong » dang cong, hang nong, bang cong
toan cau » toan cao, toan tap, toan tai
toan ban » van ban
tang va » trang va, tang van, thang va

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: theo dieu hanh - hanh tang va ((nhung cong) OR (hang cong)) tap ((toan cau) OR (toan ban))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo dieu hanh - hanh tang va ((nhung cong) or (hang cong)) tap ((toan cau) OR (toan ban))~".
• Adding a wildcard symbol may retrieve word variants: theo dieu hanh - hanh tang va ((nhung cong) or (hang cong)) tap ((toan cau) OR (toan ban))*.