Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
kho tang » cao tang
hieu van » hieu va, thien van, lieu va
van hanh » van thanh, ban hanh, van ban
vai cua » dai cua, hai cua, lai cua
van anh » van thanh, tuan anh, van minh
van lam » van nam
lam xuc » cam xuc, lam duoc
tang ma » mang may, tang van
su sach » so sach, vu sach
cua tre » cua te, cuu tre, cua triet

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((thuoc sach) or (su sach)) kho tang ma hoa. hieu van lam xuc ((van hanh) OR (van anh)) vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuoc sach) OR (su sach)) kho tang ma hoa. hieu van lam xuc ((van hanh) OR (van anh)) vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thuoc sach) or (su sach)) kho tang ma hoa. hieu van lam xuc ((van hanh) OR (van anh)) vai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((thuoc sach) or (su sach)) kho tang ma hoa. hieu van lam xuc ((van hanh) OR (van anh)) vai cua tre*.