Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hanh trinh » canh tranh, hanh chinh
hoc thiet » hoc thieu, hoc thuyet, toc thieu
trinh cua » tinh cua, trinh luat, trinh quan
cua nhung » va nhung
ban thanh » ban hanh, ban hang
dan toan » van toan, dan than, manh toan

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 thiet) OR (hoc hien)) tach - hanh trinh cua nhung cong ((dan toan) OR (ban thanh)) cau~.
• Adding a wildcard symbol may retrieve word variants: ((hoc thiet) or (hoc hien)) tach - hanh trinh cua nhung cong ((dan toan) or (ban thanh)) cau*.