Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
hieu van » hieu va, thien van, lieu va
te sach » toc sach
cam duc » cam xuc, pham duc, nam duoc
cao duc » dao duc, cao suc, giao duc
va hanh » van hanh, va thanh, va danh
cau tra » ca tra, cau ra, cau truc
y nang » ky nang, ly nang, v nang
de cau » ke cau, le cau, ve cau
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 van ((cam duc) OR (cao duc)) ((va hanh) or (van thanh)) de cau tra~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang x hoi. hieu van ((cam duc) OR (cao duc)) ((va hanh) OR (van thanh)) de cau tra.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y nang x hoi. hieu van ((cam duc) OR (cao duc)) ((va hanh) or (van thanh)) de cau tra".
• Adding a wildcard symbol may retrieve word variants: te sach y nang x hoi. hieu van ((cam duc) OR (cao duc)) ((va hanh) or (van thanh)) de cau tra*.