Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
cau tren » cu tren, dau tren, ca tren
thanh ke » thanh ket, thanh ve, thanh de
truc van » truc va, thuc van, truc ban
cua tre » cua te, cuu tre, cua triet
te sach » toc sach
hieu ve » hieu va, hieu van
y nang » ky nang, ly nang, v nang
ve cau » ke cau, va cau, ve cac
o hoi » co hoi, o hoc, o hai
x hoi » xa hoi, x ho, 5 hoi

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 hoi) OR (o hoi)). hieu ve cau truc van thanh ke ((cua tre) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang ((x hoi) OR (o hoi)). hieu ve cau truc van thanh ke ((cua tre) OR (cau tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y nang ((x hoi) OR (o hoi)). hieu ve cau truc van thanh ke ((cua tre) or (cau tren))".
• Adding a wildcard symbol may retrieve word variants: te sach y nang ((x hoi) OR (o hoi)). hieu ve cau truc van thanh ke ((cua tre) or (cau tren))*.