Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
sach nuoc » sach duoc, cac nuoc, bach tuoc
van sach » ban sach, van hach, ngan sach
van dang » van dong, van dung, van nang
thi van » thi lan, thi hanh, thi nang
va dang » va nang, va lang, da dang
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
x hoi » o 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 y nang ((x hoi) OR (xa hoi)). thi van sach nuoc ((va dang) or (van dang)) tri cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach y nang ((x hoi) OR (xa hoi)). thi van sach nuoc ((va dang) OR (van dang)) tri cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach y nang ((x hoi) OR (xa hoi)). thi van sach nuoc ((va dang) or (van dang)) tri cua tre*".