Perhaps you should try some spelling variations:
sach tien » sach tren, sach thieu
cac tinh » dac tinh, cuu tinh, ha tinh
tinh cao » tinh lao, tinh chat, tinh cach
cao khoa » lao khoa, bao khoa, cac khoa
khoa hoc » hoa hoc
sac tinh » dac tinh, sat tinh, may tinh
tinh nam » tinh lao, tinh va
nam nha » nam nhat, nam nham, nam ha
nha hoc » nha thuoc, nha nuoc, thai hoc
so sach » so sanh, bo sach, co sach
tien da » tien dam, tien dat, tien dua
te sac » te sach, te cac, te san

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((( tu cac tinh cao khoa hoc ) or ( te sac tinh nam nha hoc ))) or ( so sach tien da khoa hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((( tu cac tinh cao khoa hoc ) OR ( te sac tinh nam nha hoc ))) OR ( so sach tien da khoa hoc )).
• Adding a wildcard symbol may retrieve word variants: (((( tu cac tinh cao khoa hoc ) or ( te sac tinh nam nha hoc ))) or ( so sach tien da khoa hoc ))*.