Perhaps you should try some spelling variations:
sach trien » sach tien, sach tren, sach thieu
sach tham » sach nha
trien thi » trieu thi, tren thi, trien chi
toc sach » hoc sach, doc sach, thuoc sach
tham tri » tam tri, thanh tri, kham trai
thu sach » thuat sach, thuoc sach, thu hoach
tren tri » trien tri, tren thi, tran tri
tu sach » su sach, tu cach, 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: (( toc sach tham tri ) or ((( ((tu sach) OR (thu sach)) tren tri ) or ( te sach trien thi ))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( toc sach tham tri ) OR ((( ((tu sach) OR (thu sach)) tren tri ) OR ( te sach trien thi )))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( toc sach tham tri ) or ((( ((tu sach) OR (thu sach)) tren tri ) or ( te sach trien thi ))))".
• Adding a wildcard symbol may retrieve word variants: (( toc sach tham tri ) or ((( ((tu sach) OR (thu sach)) tren tri ) or ( te sach trien thi ))))*.