Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
hanh hai » thanh hai, nhanh hai, hang hai
hieu va » lieu va, hieu qua
va tham » van tham, va cham, va thanh
hai cua » thai cua, dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
sach v » sach va, sach y, sach 2
xuc va » duc va, tuc va, luc va
loc va » hoc va, luc va
v nang » va nang, vu nang, van nang
x hoi » o hoi, x ho, 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: thuat sach v nang ((x hoi) OR (xa hoi)). hieu va tham ((xuc va) or (loc va)) hanh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach v nang ((x hoi) OR (xa hoi)). hieu va tham ((xuc va) OR (loc va)) hanh hai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach v nang ((x hoi) OR (xa hoi)). hieu va tham ((xuc va) or (loc va)) hanh hai cua tre".
• Adding a wildcard symbol may retrieve word variants: thuat sach v nang ((x hoi) OR (xa hoi)). hieu va tham ((xuc va) or (loc va)) hanh hai cua tre*.