Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
chat trung » chat trong, ha trung, cua trung
trung cong » truong cong, trong cong, trung uong
kien sach » dien sach, vien bach, kien mac
hanh tinh » hanh trinh, nhanh tinh, thanh tinh
cong sat » cong suat, cong san, cong hat
sat nhan » hat nhan, sat phan, ca nhan
nhan lap » phan lap, thanh lap, nhan loai

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((chieu sach) or (kien sach)) - hanh tinh chat trung cong sat nhan lap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sach) OR (kien sach)) - hanh tinh chat trung cong sat nhan lap*.