Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hanh trinh » canh tranh, hanh chinh
thong cong » trong cong, tong cong, thong thong
doi chieu » doc hieu, doi chi, ho chieu
trinh cua » tinh cua, trinh luat, trinh quan
dung cong » dung trong
dan tuan » doan tuan, van tuan, dan luan
tuan thu » toan thuc, van thu

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: doi chieu sach - hanh trinh cua ((dung cong) OR (thong cong)) dan tuan thu~.
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - hanh trinh cua ((dung cong) or (thong cong)) dan tuan thu*.