Perhaps you should try some spelling variations:
dang khoai » dang khoi, dang khai, dang hoai
dang khoa » dung khoa, hang khoa, dang khoi
toc sach » hoc sach, doc sach, thuoc sach
sach ky » sac ky, sach y, sach ty
va kinh » va tinh, qua kinh
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
co xuc » co xuoc, co xua
vi cua » vai cua, di cua
va co » vo co

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 ((dang khoa) or (dang khoai)) hoi. hieu va co xuc ((va hanh) or (va kinh)) vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky ((dang khoa) OR (dang khoai)) hoi. hieu va co xuc ((va hanh) OR (va kinh)) vi cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach ky ((dang khoa) or (dang khoai)) hoi. hieu va co xuc ((va hanh) or (va kinh)) vi cua tre*.