Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
pham thuc » phap thuc, pham chuc, nham thuc
va doanh » van doanh, vay doanh, va danh
day cua » dai cua
vu pham » su pham, vi pham, vu kham
hieu vu » hieu va, hieu ve, hieu su
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
va dan » va dao, va dau, va dap
ca dan » cac dan, ca dao

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

• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach y nang xa hoi. hieu vu pham thuc ((va doanh) OR (((va dan) OR (ca dan)))) day cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach y nang xa hoi. hieu vu pham thuc ((va doanh) or (((va dan) OR (ca dan)))) day cua tre~".
• Adding a wildcard symbol may retrieve word variants: thuoc sach y nang xa hoi. hieu vu pham thuc ((va doanh) or (((va dan) OR (ca dan)))) day cua tre*.