Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
hanh hai » nhanh hai, hang hai, hanh tai
hieu van » hieu va, thien van, lieu va
su sach » vu sach
cac duc » cac du, cao duc, cac dac
van cac » van hac, van cau, van bac
ty nang » ky nang, ty xang, ty hang
so sach » so sanh, bo sach, co sach
cua tre » cua te, cuu tre, cua triet
x hoi » xa hoi, o hoi, x ho

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: ((su sach) OR (so sach)) ty nang x hoi. hieu van cac duc va ((hanh hai) OR (thanh hai)) cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (so sach)) ty nang x hoi. hieu van cac duc va ((hanh hai) or (thanh hai)) cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (so sach)) ty nang x hoi. hieu van cac duc va ((hanh hai) or (thanh hai)) cua tre*.