Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
danh tai » doanh tai, dinh tai, hanh tai
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
thuc va » thuc vat, thuc dan, thuc day
va danh » va dinh, va dan, va hanh
cuc tre » duc tre, cuu tre, cuc thue
cua tre » cuu tre, cua triet, dua tren
y nang » ky nang, ly nang, v nang
nang o » nang co, nang ho, nang ro
va nam » van nam, ha nam, va nay
cua te » cua tu
o hoi » co hoi, o hoc, o hai

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

• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang o hoi. hieu va nam thuc va danh tai ((cuc tre) OR (((cua tre) OR (cua te))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang o hoi. hieu va nam thuc va danh tai ((cuc tre) or (((cua tre) OR (cua te))))~".
• Adding a wildcard symbol may retrieve word variants: su sach y nang o hoi. hieu va nam thuc va danh tai ((cuc tre) or (((cua tre) OR (cua te))))*.