Perhaps you should try some spelling variations:
cua quoc » cua nuoc, cua thuoc
van nang » van quang, van ban, van dong
van hanh » van thanh, ban hanh, van anh
thuc van » thuc vat, thuc dan, thuc va
nam thuc » nam thuoc, am thuc, nam thu
hieu va » lieu va, hieu qua
hanh di » hanh vi, hanh de, hang di
vu sach » vu bach, su sach, vu khach
hieu ve » hieu van
y nang » ky nang, ly nang, v nang
di cua » dai cua, doi cua, de cua
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ((y nang) or (van nang)) x hoi. ((hieu ve) or (hieu va)) nam thuc van hanh di cua quoc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ((y nang) OR (van nang)) x hoi. ((hieu ve) OR (hieu va)) nam thuc van hanh di cua quoc.
• Adding a wildcard symbol may retrieve word variants: vu sach ((y nang) or (van nang)) x hoi. ((hieu ve) or (hieu va)) nam thuc van hanh di cua quoc*.