Perhaps you should try some spelling variations:
sach trinh » sach tranh, hanh trinh, sach kinh
sach vien » sach tien, sach viet, sinh vien
trinh lam » trinh lap, trinh tam, trinh cam
vien cao » vien cac, vien dai, vien da
cao khoa » lao khoa, bao khoa, cac khoa
khoa hoc » hoa hoc
sach dao » lanh dao
su sach » so sach, vu sach
te sach » toc sach
lam khi » lam kho, ham khai, lam khac
khi hoc » khi hoi, khien hoc, thai hoc
tu sach » thu sach, tu cach, vu sach
dao ly » dai ly, dao le, dao li

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 vien cao khoa hoc ) or ( te sach trinh lam khi hoc ))) or ( tu sach dao ly khoa hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((( su sach vien cao khoa hoc ) OR ( te sach trinh lam khi hoc ))) OR ( tu sach dao ly khoa hoc )).
• Adding a wildcard symbol may retrieve word variants: (((( su sach vien cao khoa hoc ) or ( te sach trinh lam khi hoc ))) or ( tu sach dao ly khoa hoc ))*.