Perhaps you should try some spelling variations:
hanh dieu » han dieu, hinh dieu, hoang dieu
khoa doi » khoa hoi, khoa noi, khoan hoi
dieu tra » dieu tri, kiem tra, dieu cua
kho tang » cao tang
dao hanh » dao thanh, dang hanh, ban hanh
thuc dao » thuc dan, thuc day, chuc dao
nam thuc » nam thuoc, am thuc, nam thu
tu sach » thu sach, te sach, tu cach
hieu ve » hieu va, hieu van
hoa doi » hoa dai, hoc doi, xoa doi
su sach » so sach, vu sach
tra tre » tran tren, tran tri, tran tro
ve nam » he nam, va nam, le nam

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (su sach)) kho tang ((hoa doi) or (khoa doi)). hieu ve nam thuc dao hanh dieu tra tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) kho tang ((hoa doi) OR (khoa doi)). hieu ve nam thuc dao hanh dieu tra tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) kho tang ((hoa doi) or (khoa doi)). hieu ve nam thuc dao hanh dieu tra tre*.