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

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 khi) OR (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 khi) OR (cao khai)) đong luc ) OR ( thuoc sach trinh co khi đong luc )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( te sach dao ((cao khi) OR (cao khai)) đong luc ) or ( thuoc sach trinh co khi đong luc ))".
• Adding a wildcard symbol may retrieve word variants: (( te sach dao ((cao khi) OR (cao khai)) đong luc ) or ( thuoc sach trinh co khi đong luc ))*.