Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
van nang » van quang, van ban, van dong
cap nuoc » dat nuoc
vanh dai » van dai, vanh tai, lanh dao
hieu va » lieu va, hieu qua
va vanh » va van, va danh, va hanh
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, may nang
v nang » va nang, vu nang, voi nang
va cap » va cac, va dap, va cao
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ((y nang) or (((v nang) OR (van nang)))) x hoi. hieu va cap nuoc va vanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((y nang) OR (((v nang) OR (van nang)))) x hoi. hieu va cap nuoc va vanh dai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((y nang) or (((v nang) OR (van nang)))) x hoi. hieu va cap nuoc va vanh dai cua tre*".