Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
vu sach » vu bach, su sach, vu khach
thuc va » thuc vat, thuc dan, thuc day
hieu ve » hieu van
danh vi » dinh vi, danh di, danh va
hieu va » lieu va, hieu qua
y nang » ky nang, ly nang, v nang
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 vi) OR (hanh 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 vi) OR (hanh 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 vi) OR (hanh vi)) cua te*".