Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
dang thai » dang thi, dang hai, dang khai
bac nuoc » cac nuoc, bach tuoc, sach nuoc
nuoc van » nuoc va, nuoc san, luoc van
van dang » van dong, van dung, van nang
sach ky » sac ky, sach y, sach ty
thi van » thi lan, thi hanh, thi nang
van bac » van ban, van bao, van hac
cua tre » cuu tre, cua triet, dua tren
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: thuoc sach ky nang ((x hoi) or (x ho)). thi van bac nuoc van dang thai ((cua tre) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ky nang ((x hoi) OR (x ho)). thi van bac nuoc van dang thai ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ky nang ((x hoi) or (x ho)). thi van bac nuoc van dang thai ((cua tre) OR (cua te))".
• Adding a wildcard symbol may retrieve word variants: thuoc sach ky nang ((x hoi) or (x ho)). thi van bac nuoc van dang thai ((cua tre) OR (cua te))*.