Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
cao thuc » cao thuoc, bao thuc, can thuc
te sach » toc sach
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
cua tre » cuu tre, cua triet, dua tren
sach 2 » sach y
2 nang » v nang
va cao » va cac, va co, va dao
cua te » cua tu
x hoi » xa hoi, o hoi, 5 hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach 2 nang ((x hoi) or (x ho)). lieu va cao thuc va hanh vai ((cua tre) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach 2 nang ((x hoi) OR (x ho)). lieu va cao thuc va hanh vai ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach 2 nang ((x hoi) or (x ho)). lieu va cao thuc va hanh vai ((cua tre) OR (cua te))".
• Adding a wildcard symbol may retrieve word variants: te sach 2 nang ((x hoi) or (x ho)). lieu va cao thuc va hanh vai ((cua tre) OR (cua te))*.