Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
cua triet » cua viet, va triet
su triet » su viet, su tien, ve triet
thanh vi » hanh vi, thanh va, thanh ve
sach ky » sac ky, sach y, sach ty
duc van » duc va, duc tan, duc manh
tu sach » thu sach, su sach, te sach
hieu va » hieu qua
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
cao duc » dao duc, cao suc, giao duc

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky lang xa hoi. ((hieu va) or (lieu va)) cao duc van thanh vi ((cua triet) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky lang xa hoi. ((hieu va) OR (lieu va)) cao duc van thanh vi ((cua triet) OR (su triet)).
• Adding a wildcard symbol may retrieve word variants: tu sach ky lang xa hoi. ((hieu va) or (lieu va)) cao duc van thanh vi ((cua triet) or (su triet))*.