Perhaps you should try some spelling variations:
dang khoa » dung khoa, hang khoa, dang khoi
toc sach » hoc sach, doc sach, thuoc sach
khoa hoi » khoan hoi, khoa hoc, khoa doi
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, va dan, dia danh
cao xuc » cam xuc, cao duc, cao suc
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
ky dang » ky nang, ky danh
cua tre » cua te, cuu tre, cua triet
va cao » va cac, va co, va dao
di cua » dai cua, doi cua, de cua

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