Perhaps you should try some spelling variations:
thien van » thi van
hieu van » hieu va, lieu va, hieu ve
bao thuc » cao thuoc, am thuc, va thuc
su sach » so sach, vu sach
hang co » hang cho, hang ca, nang co
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
y hang » ly hang, ty hang, yu hang
co hoi » co hoc, co loi
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: su sach y hang co hoi. ((hieu van) or (thien van)) bao thuc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y hang co hoi. ((hieu van) OR (thien van)) bao thuc va hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach y hang co hoi. ((hieu van) or (thien van)) bao thuc va hanh vi cua tre*.