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
doi cua » dai cua, hoi cua, dong cua
va danh » va dinh, va dan, dia danh
sach ky » sac ky, sach y, sach ty
cao xuc » cam xuc, cao duc, cao suc
hieu va » lieu va, hieu qua
ky dang » ky nang, ky danh
va cao » va cac, va co, va dao
di cua » dai cua, de cua, do 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) OR (doi 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) OR (doi cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky dang khoa hoi. hieu va cao xuc ((va hanh) or (va danh)) ((di cua) OR (doi 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) OR (doi cua)) tre*.