Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
thanh van » thanh toan, thanh phan, thanh nhan
cam tuc » cam xuc, cam tu, nam thuc
hieu va » lieu va, hieu qua
sach lo » sach dao, sach doi, sach hoi
lo nang » ho nang, ly nang, loai nang
cuu tre » cua tre, cau tren, cau treo
va cam » va cham, va cac, va cao
tuc va » thuc va, truc va, tuc xa
o hoi » co hoi, o hoc, o hai
x hoi » xa hoi, x ho, 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: thuoc sach lo nang ((x hoi) or (o hoi)). hieu va cam tuc va ((thanh van) OR (thanh san)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach lo nang ((x hoi) OR (o hoi)). hieu va cam tuc va ((thanh van) OR (thanh san)) cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach lo nang ((x hoi) or (o hoi)). hieu va cam tuc va ((thanh van) OR (thanh san)) cuu tre*".