Perhaps you should try some spelling variations:
sach nang » cach mang, sach dung, sach danh
toc sach » hoc sach, doc sach, thuoc sach
don gian » dan gian
sac tinh » dac tinh, cac tinh, sat tinh
nang su » dang su, nang du, nang tu
tinh su » trinh su, hinh su, tinh tu
vu sac » vu sach, vu san, va sac
so gia » so giai, so giao, ho gia

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 nang su - don gian ) or ( vu sac tinh su - so gia ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( toc sach nang su - don gian ) OR ( vu sac tinh su - so gia )).
• Adding a wildcard symbol may retrieve word variants: (( toc sach nang su - don gian ) or ( vu sac tinh su - so gia ))*.