Perhaps you should try some spelling variations:
van thanh » van tuan
ban thanh » ban hanh, ban hang
cau tren » cu tren, dau tren, ca tren
hieu ve » hieu va, hieu van
cau luc » cau truc, cau phuc
cua tre » cua te, cuu tre, cua triet
te sach » toc sach
ve cau » ke cau, va cau, ve cac
y nang » ky nang, ly nang, v 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 x hoi. hieu ve cau luc ((van thanh) OR (ban 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. hieu ve cau luc ((van thanh) OR (ban 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. hieu ve cau luc ((van thanh) OR (ban thanh)) ke ((cua tre) or (cau tren))".
• Adding a wildcard symbol may retrieve word variants: te sach y nang x hoi. hieu ve cau luc ((van thanh) OR (ban thanh)) ke ((cua tre) or (cau tren))*.