Perhaps you should try some spelling variations:
chieu sach » chinh sach, chieu sang, chieu xanh
hanh trinh » canh tranh, hanh chinh
trinh luan » trinh luat, trinh quan, trinh han
luan hoat » luan hoan, qua hoat, luan khoa
hoat cong » hoat dong, hoa cong, thuat cong
cong anh » cong danh, dong anh, hong anh
anh nhan » danh nhan, doanh nhan, thanh nhan
nhan cau » nhanh cau, phan cau, nhan sau

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((chieu sach) or (chiet tach)) - hanh trinh luan hoat cong anh nhan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chieu sach) OR (chiet tach)) - hanh trinh luan hoat cong anh nhan cau*.