Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
thuat lanh » thuat lap, thuat san
nhan thuc » nhan luc, dan thuc, toan thuc
danh vai » danh sai, danh va, doanh van
vai cuu » vai cua
va danh » va dinh, va dan, va hanh
thuc va » thuc vat, thuc dan, thuc day
va nhan » van nhan, ca nhan, va phan
cuu tre » cua tre, cau tren, cau treo
x hoi » xa hoi, x ho, 5 hoi
o hoi » co hoi, o hoc, o hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thuoc sach) or (thuat lanh)) ty xang ((x hoi) OR (o hoi)). lieu va nhan thuc va danh vai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuoc sach) OR (thuat lanh)) ty xang ((x hoi) OR (o hoi)). lieu va nhan thuc va danh vai cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thuoc sach) or (thuat lanh)) ty xang ((x hoi) OR (o hoi)). lieu va nhan thuc va danh vai cuu tre".
• Adding a wildcard symbol may retrieve word variants: ((thuoc sach) or (thuat lanh)) ty xang ((x hoi) OR (o hoi)). lieu va nhan thuc va danh vai cuu tre*.