Perhaps you should try some spelling variations:
nhiet tach » chiet tach
hanh trinh » canh tranh, hanh chinh
cua thuong » cua truong, cua phuong, cua huong
hoc nhiet » hoc thiet, hoc nghien, hoc hien
ca thuong » cao thuong, va thuong, cp thuong
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan ban » van ban

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc nhiet tach - hanh trinh ((cua thuong) OR (ca thuong)) cong tac toan ban~".
• Adding a wildcard symbol may retrieve word variants: hoc nhiet tach - hanh trinh ((cua thuong) OR (ca thuong)) cong tac toan ban*.