Perhaps you should try some spelling variations:
chiet tach » chieu sach
hanh trinh » canh tranh, hanh chinh
thong cong » trong cong, tong cong, thong thong
thuong con » thuong dong, truong cong, thuong chi
hoc chiet » hoc thiet, hoc nhiet, hoc hien
trinh ca » trinh cau, trinh cua, trinh cac
dan chan » dan gian, dan ca, van chat
doan » doanh, toan, soan

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc chiet tach - hanh trinh ca ((thong cong) or (thuong con)) dan chan doan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chiet tach - hanh trinh ca ((thong cong) OR (thuong con)) dan chan doan.
• Adding a wildcard symbol may retrieve word variants: hoc chiet tach - hanh trinh ca ((thong cong) or (thuong con)) dan chan doan*.