Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh vai » thanh hai, thanh van, thanh tai
tu sach » thu sach, su sach, te sach
cac dac » cac dan, cac dai, cac bac
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo
cac duc » cac du, cao duc, cac nuoc
hieu ve » hieu va, hieu van
y nang » ky nang, ly nang, v nang
nang o » nang co, nang ho, nang ro
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: tu sach y nang o hoi. hieu ve ((cac duc) or (cac dac)) ban thanh vai ((cua tre) OR (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang o hoi. hieu ve ((cac duc) OR (cac dac)) ban thanh vai ((cua tre) OR (cuu tre))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang o hoi. hieu ve ((cac duc) or (cac dac)) ban thanh vai ((cua tre) OR (cuu tre))*".