Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
ban banh » ban hanh, ban anh, ban danh
hieu van » hieu va, thien van, hieu ve
sach ty » sach y, sach tu, sach thu
lam xuc » cam xuc, lam duoc
xuc ban » duc ban, cuc ban, quoc ban
ty nang » ky nang, ty xang, ty hang
banh vi » hanh vi, ban vi, benh vi
cua tre » cua te, cuu tre, cua triet
co hoi » co hoc, co loi
vi cua » vai cua, di cua
o hoi » o hoc, o hai, o hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach ty nang ((o hoi) or (co hoi)). ((hieu van) or (lieu va)) lam xuc ban banh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ty nang ((o hoi) OR (co hoi)). ((hieu van) OR (lieu va)) lam xuc ban banh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: thuat sach ty nang ((o hoi) or (co hoi)). ((hieu van) or (lieu va)) lam xuc ban banh vi cua tre*.