Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
dinh vai » dinh van, dinh vi, dinh va
hieu van » hieu va, thien van, lieu va
dang xay » dang van, van xay
vai cua » dai cua, hai cua, lai cua
va dinh » van dinh, va kinh, va tinh
cao duc » dao duc, cao suc, giao duc
van cao » van dao, van bao, van hao
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa

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: tu sach ky ((((nang xa) OR (nang ma))) OR (dang xay)) hoi. hieu van cao duc va dinh vai cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((((nang xa) OR (nang ma))) or (dang xay)) hoi. hieu van cao duc va dinh vai cua triet~".
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((((nang xa) OR (nang ma))) or (dang xay)) hoi. hieu van cao duc va dinh vai cua triet*.