Perhaps you should try some spelling variations:
chiet tach » chieu sach
hanh trinh » canh tranh, hanh chinh
duong cong » dung cong, luong cong, duong trong
hoc chiet » hoc thiet, hoc nhiet, hoc hien
trinh cua » tinh cua, trinh luat, trinh quan
cua duong » cua dong, cua huong, qua duong
dang toan » dan toan, dung toan, dang thanh
dang tran » dang thanh, quang tran, hoang tran

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 chiet tach - hanh trinh cua duong cong ((dang toan) OR (dang tran)) cao~".
• Adding a wildcard symbol may retrieve word variants: hoc chiet tach - hanh trinh cua duong cong ((dang toan) OR (dang tran)) cao*.