Perhaps you should try some spelling variations:
sach trinh » sach tranh, hanh trinh, sach kinh
trinh co » trinh do, trinh cong, trinh hoa
sach han » sach tham, sach danh, sach nang
han cong » phan cong, hang cong, hanh cong
cong khi » cong thai, khong khi, cong ha
so sach » so sanh, bo sach, co sach
su sach » vu sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( so sach trinh co khi đong luc ) or ( su sach han cong khi đong luc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( so sach trinh co khi đong luc ) OR ( su sach han cong khi đong luc ))*.