Perhaps you should try some spelling variations:
hanh dieu » han dieu, hinh dieu, hoang dieu
toc sach » hoc sach, doc sach, thuoc sach
dieu cua » dieu tra
van hanh » van thanh, ban hanh, van anh
phuc van » thuc van, phuc va, chuc van
sach ky » sac ky, sach y, sach ty
cua tre » cua te, cuu tre, cua triet
nang ma » tang ma, sang ma, mang may
va cau » van cau, va cac, va cao
va dau » va dao

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ky ((nang ma) OR (nang cao)) hoa. hieu ((va cau) or (va dau)) phuc van hanh dieu cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky ((nang ma) OR (nang cao)) hoa. hieu ((va cau) OR (va dau)) phuc van hanh dieu cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky ((nang ma) OR (nang cao)) hoa. hieu ((va cau) or (va dau)) phuc van hanh dieu cua tre*".