Perhaps you should try some spelling variations:
sach tinh » sach kinh, sach tranh, trach tinh
sac tinh » dac tinh, cac tinh, sat tinh
tinh cao » tinh lao, tinh chat, tinh cach
su sach » so sach, vu sach
tinh co » trinh co, tinh cho, tich co
cao khi » cao khai, cao thi, cac khi
su sac » su cac, su xac

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (( su sach tinh co khi đong luc ) or ( su sac tinh cao khi đong luc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( su sach tinh co khi đong luc ) OR ( su sac tinh cao khi đong luc )).
• Adding a wildcard symbol may retrieve word variants: (( su sach tinh co khi đong luc ) or ( su sac tinh cao khi đong luc ))*.