Perhaps you should try some spelling variations:
chiet tach » chieu sach
doi chiet » doi chieu, doi chi, doi viet
hanh tinh » hanh trinh, nhanh tinh, thanh tinh
tong cong » cong cong, dung cong, dang cong
tinh cua » trinh cua, sinh cua, tinh chat
toan cao » toan tap
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi chiet tach - hanh tinh cua ((tong cong) or (trong cong)) tan ((toan cao) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chiet tach - hanh tinh cua ((tong cong) OR (trong cong)) tan ((toan cao) OR (toan ban)).
• Adding a wildcard symbol may retrieve word variants: doi chiet tach - hanh tinh cua ((tong cong) or (trong cong)) tan ((toan cao) or (toan ban))*.