Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
hieu va » lieu va, hieu qua
hanh de » hanh ve, hanh kem
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
su sach » so sach
cua tre » cua te, cuu tre, cua triet
vu sach » vu bach, vu khach
co hoi » co hoc, co loi
va nam » van nam, ha nam, va nay
y nang » ky nang, ly nang, v nang
de cua » le cua, te cua, dieu cua
o hoi » o hoc, o hai, o hoa

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) or (vu sach)) y nang ((o hoi) or (co hoi)). hieu va nam thuc va hanh de cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) y nang ((o hoi) OR (co hoi)). hieu va nam thuc va hanh de cua tre.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu sach)) y nang ((o hoi) or (co hoi)). hieu va nam thuc va hanh de cua tre*.