Perhaps you should try some spelling variations:
sach tranh » canh tranh
sach tinh » sach kinh, sac tinh, trach tinh
tinh than » tinh thanh, tinh toan, tinh thai
tranh tri » trang tri, thanh tri, tran tri
sach dao » lanh dao
te sach » toc sach
tu sach » thu sach, tu cach, vu sach
dao thi » do thi, dan thi, dang thi
su sach » so sach, 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: (((( te sach tinh than ) or ( tu sach dao thi ))) or ( su sach tranh tri ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((( te sach tinh than ) OR ( tu sach dao thi ))) OR ( su sach tranh tri )).
• Adding a wildcard symbol may retrieve word variants: (((( te sach tinh than ) or ( tu sach dao thi ))) or ( su sach tranh tri ))*.