Perhaps you should try some spelling variations:
thanh dai » thanh tai, thanh dat, thanh oai
thanh hai » thanh phan, thanh hoa, thanh san
hieu van » hieu va, thien van, lieu va
te sach » toc sach
van cac » van hac, van cau, van bac
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
cac su » cach su, cac sau, cac du
su va » su van, tu va

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach y nang x ho. hieu van cac su va ((thanh dai) or (thanh hai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang x ho. hieu van cac su va ((thanh dai) OR (thanh hai)) cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach y nang x ho. hieu van cac su va ((thanh dai) or (thanh hai)) cua tre*.