Perhaps you should try some spelling variations:
sach tranh » canh tranh
sach nhan » sach nha, sach han, sach ngan
toc sach » hoc sach, doc sach, thuoc sach
tranh ly » trinh ly, tranh lam, doanh ly
su sach » so sach, vu sach
nhan ky » nhan y, nhat ky, than ky
ly khi » ly chi
ky khi » ky thi

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 tranh ly khi đong luc ) or ( su sach nhan ky khi đong luc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( toc sach tranh ly khi đong luc ) OR ( su sach nhan ky khi đong luc )).
• Adding a wildcard symbol may retrieve word variants: (( toc sach tranh ly khi đong luc ) or ( su sach nhan ky khi đong luc ))*.