Perhaps you should try some spelling variations:
sach thamh » sach tham, sach tranh
treng trai » trang trai, truong trai, trang tri
sach tren » sach tien, sach tranh
thamh tri » thanh tri, tham tri, thanh tra
tren tri » trien tri, tren thi, tran tri
toc sach » hoc sach, thuoc sach, nuoc sach
doc sach » hoc sach, nuoc sach, dac sac
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: (((( tu sach tren tri ) or ( te sach thamh tri ))) or ( ((toc sach) OR (doc sach)) treng trai ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((( tu sach tren tri ) OR ( te sach thamh tri ))) OR ( ((toc sach) OR (doc sach)) treng trai )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((( tu sach tren tri ) or ( te sach thamh tri ))) or ( ((toc sach) OR (doc sach)) treng trai ))".
• Adding a wildcard symbol may retrieve word variants: (((( tu sach tren tri ) or ( te sach thamh tri ))) or ( ((toc sach) OR (doc sach)) treng trai ))*.