Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
ban thanh » ban hanh, ban hang
te sach » toc sach
cac dac » cac dan, cac dai, cac bac
vai cua » dai cua, hai cua, lai cua
cac duc » cac du, cao duc, cac nuoc
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
y nang » ly nang, v nang, may nang
o hoi » co hoi, o hoc, o hai

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) OR (ky nang)) o hoi. hieu ve ((cac duc) or (cac dac)) ban thanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((y nang) OR (ky nang)) o hoi. hieu ve ((cac duc) OR (cac dac)) ban thanh vai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((y nang) OR (ky nang)) o hoi. hieu ve ((cac duc) or (cac dac)) ban thanh vai cua tre*".