Perhaps you should try some spelling variations:
dung khoa » dung cho
toc sach » doc sach, thuoc sach, nuoc sach
hoc sach » hoc sinh, hoc cac, hoc anh
khoa hoi » khoan hoi, khoa hoc, khoa doi
va thanh » gia thanh, ban thanh, va tinh
cao xuc » cam xuc, cao duc, cao suc
va danh » va dinh, va dan, va hanh
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
ky dung » ly dung, ky dang, ky vung
di cua » dai cua, doi cua, de cua
va cao » va cac, va co, 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) or (hoc sach)) ky dung khoa hoi. hieu va cao xuc ((va thanh) or (va danh)) di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (hoc sach)) ky dung khoa hoi. hieu va cao xuc ((va thanh) OR (va danh)) di cua tre.
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (hoc sach)) ky dung khoa hoi. hieu va cao xuc ((va thanh) or (va danh)) di cua tre*.