Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nam thuc, nham thu
xanh tai » hanh tai, anh tai, vanh tai
vu sach » vu bach, su sach, vu khach
va nham » va cham, va tham, va nha
thuc va » thuc vat, thuc dan, thuc day
va xanh » va danh, va hanh, va anh
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, me hoi

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 ((ma hoi) or (ma hoa)). lieu va nham thuc va xanh tai ((cua su) OR (qua su))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach y nang ((ma hoi) OR (ma hoa)). lieu va nham thuc va xanh tai ((cua su) OR (qua su)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach y nang ((ma hoi) or (ma hoa)). lieu va nham thuc va xanh tai ((cua su) OR (qua su))".
• Adding a wildcard symbol may retrieve word variants: vu sach y nang ((ma hoi) or (ma hoa)). lieu va nham thuc va xanh tai ((cua su) OR (qua su))*.