Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
sach trinh » sach tranh, hanh trinh, sach kinh
sach dao » lanh dao
cao khai » cao chat, cao tai, cao thi
trinh co » trinh do, trinh cong, trinh hoa
te sach » toc sach
dao cao » dao tao, bao cao, tao cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( te sach dao cao khai đong luc ) or ( thuoc sach trinh co khi đong luc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( te sach dao cao khai đong luc ) OR ( thuoc sach trinh co khi đong luc )).
• Adding a wildcard symbol may retrieve word variants: (( te sach dao cao khai đong luc ) or ( thuoc sach trinh co khi đong luc ))*.