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
cua tre » cua te, cuu tre, cua triet
luc van » luoc van, luu van, duc van
te sach » toc sach
hieu ve » hieu va, hieu van
ly nang » ky nang, ly hang, ly vang
cau luc » cau truc, cau phuc
ve cau » ke cau, va cau, ve cac
y nang » ky nang, v nang, may nang
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: te sach ((y nang) OR (ly nang)) x hoi. hieu ve cau luc 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) OR (ly nang)) x hoi. hieu ve cau luc 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) OR (ly nang)) x hoi. hieu ve cau luc van thanh ke ((cua tre) or (cau tren))".
• Adding a wildcard symbol may retrieve word variants: te sach ((y nang) OR (ly nang)) x hoi. hieu ve cau luc van thanh ke ((cua tre) or (cau tren))*.