Perhaps you should try some spelling variations:
lao khien » bao thien, cao thien, lao dien
sach vien » sach tien, sach viet, sinh vien
khien hoc » nhiet hoc, dien hoc
vien cao » vien cac, vien dai, vien da
cao khoa » lao khoa, bao khoa, cac khoa
khoa hoc » hoa hoc
sac tinh » dac tinh, cac tinh, sat tinh
tinh lao » dinh lam, tinh nam, tinh va
so sach » so sanh, bo sach, co sach
su sach » vu sach
sach xa » sach dao, sach nha, sach bai
te sac » te sach, te cac, te san
xa ly » xu ly, xa la, va ly

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((( so sach vien cao khoa hoc ) or ( te sac tinh lao khien hoc ))) or ( su sach xa ly khoa hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((( so sach vien cao khoa hoc ) OR ( te sac tinh lao khien hoc ))) OR ( su sach xa ly khoa hoc )).
• Adding a wildcard symbol may retrieve word variants: (((( so sach vien cao khoa hoc ) or ( te sac tinh lao khien hoc ))) or ( su sach xa ly khoa hoc ))*.