Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
ban thanh » ban hanh, ban hang
tu sach » thu sach, su sach, te sach
cac duc » cao duc, cac dac, cac nuoc
hai cua » thai cua, dai cua, hoi cua
hieu ve » hieu va, hieu van
y nang » ky nang, ly nang, may nang
v nang » va nang, vu nang, van nang
cua te » cua tu
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ((y nang) or (v nang)) x hoi. hieu ve ((cac duc) OR (cac du)) ban thanh hai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((y nang) OR (v nang)) x hoi. hieu ve ((cac duc) OR (cac du)) ban thanh hai cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((y nang) or (v nang)) x hoi. hieu ve ((cac duc) OR (cac du)) ban thanh hai cua te*".