Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
dua tren » dung tren
cham tuc » nham thuc, pham thuc, tham thuc
va hanh » van hanh, va thanh, va danh
sach tu » sach thu, cach tu, sach ty
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
tu nang » tru nang, tu nong, tu nano
cuu tre » cua tre, cau tren, cau treo
tuc va » thuc va, truc va, tuc xa
o hoi » co hoi, o hoc, o hai
x hoi » xa hoi, x ho, 5 hoi

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: thu sach tu nang ((x hoi) OR (o hoi)). hieu ve cham tuc va hanh vi ((dua tren) OR (cuu tre))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach tu nang ((x hoi) OR (o hoi)). hieu ve cham tuc va hanh vi ((dua tren) or (cuu tre))~".
• Adding a wildcard symbol may retrieve word variants: thu sach tu nang ((x hoi) OR (o hoi)). hieu ve cham tuc va hanh vi ((dua tren) or (cuu tre))*.