Perhaps you should try some spelling variations:
xanh hanh » danh thanh, ban hanh, van hanh
duc xanh » duc anh, duc manh, duc hanh
hieu van » hieu va, thien van, lieu va
nang xa » nang x, lang xa, nang ma
sach tu » sach thu, cach tu, sach uu
sach ty » sach y, sach thu, xach tay
cao duc » dao duc, cao suc, giao duc
van cao » van dao, van bao, van hao
vi va » vi van, vai va, bi va
vu va » vu van, tu va, su va

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sach ty) OR (sach tu)) nang xa hoi. hieu van cao duc xanh hanh ((vi va) OR (vu va)) triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((sach ty) OR (sach tu)) nang xa hoi. hieu van cao duc xanh hanh ((vi va) or (vu va)) triet~".
• Adding a wildcard symbol may retrieve word variants: toc ((sach ty) OR (sach tu)) nang xa hoi. hieu van cao duc xanh hanh ((vi va) or (vu va)) triet*.