Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
hieu va » lieu va, hieu qua
va danh » va dinh, va hanh, dia danh
vu sach » vu bach, su sach, vu khach
hieu ve » hieu van
y nang » ky nang, ly nang, v nang
va dan » ca dan, va dao, va dau
vi cua » vai cua, di cua
cua te » cua tu
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 x hoi. ((hieu ve) or (hieu va)) nam thuc ((va danh) OR (va dan)) vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach y nang x hoi. ((hieu ve) OR (hieu va)) nam thuc ((va danh) OR (va dan)) vi cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach y nang x hoi. ((hieu ve) or (hieu va)) nam thuc ((va danh) OR (va dan)) vi cua te*".