Perhaps you should try some spelling variations:
sach trien » sach tien, sach thieu, cach thien
sach thanh » sach tranh, sach tham, danh thanh
thanh tri » thanh tra, thanh tai, chinh tri
sach tren » sach tien, sach tranh
trien thi » trieu thi, tren thi, trien chi
toc sach » hoc sach, doc sach, thuoc sach
tren tri » trien tri, tren thi, tran tri
tu sach » thu sach, su sach, tu cach

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( toc sach thanh tri ) or ((( tu sach tren tri ) or ( te sach trien thi ))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( toc sach thanh tri ) OR ((( tu sach tren tri ) OR ( te sach trien thi )))).
• Adding a wildcard symbol may retrieve word variants: (( toc sach thanh tri ) or ((( tu sach tren tri ) or ( te sach trien thi ))))*.