Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
thu sach » tu sach, thuat sach, thuoc sach
ban banh » ban hanh, ban anh, ban danh
banh chi » danh cho, dinh chi, bao chi
van cam » van nam, van lam, van cau
cam cuc » cam xuc, cham cuu, pham cuc
cuc ban » cua ban, cac ban, cuu ban
chi cua » chi cuc, khi cua, cuoi cua
cua tre » cua te, cuu tre, cua triet
y nang » ly nang, v nang, may nang
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: thu sach ((y nang) or (ky nang)) ((x hoi) OR (x ho)). hieu van cam cuc ban banh chi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((y nang) OR (ky nang)) ((x hoi) OR (x ho)). hieu van cam cuc ban banh chi cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((y nang) or (ky nang)) ((x hoi) OR (x ho)). hieu van cam cuc ban banh chi cua tre*".