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 danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
ky dang » ky nang, ky danh
va cao » va co, va dao, va bao
vi cua » vai cua, di 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) OR (va cac)) xuc ((va hanh) or (va danh)) vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky dang khoa hoi. hieu ((va cao) OR (va cac)) xuc ((va hanh) OR (va danh)) vi cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky dang khoa hoi. hieu ((va cao) OR (va cac)) xuc ((va hanh) or (va danh)) vi cua tre*".