Perhaps you should try some spelling variations:
thien van » thi van
cua triet » su triet, va triet
hanh vai » hanh vi, hanh va, hanh tai
cua viet » ca viet, hoa viet, cua vat
lang van » dang van, tang van, hoang van
sach ky » sac ky, sach y, sach ty
van dau » van dao, phan dau
dau duc » dao duc, dang duc, dau nuoc
va hanh » van hanh, va thanh, va danh
nang xa » nang x, lang xa, nang ma
tu sach » thu sach, su sach, te sach

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 ((nang xa) or (lang van)) hoi. thien van dau duc va hanh vai ((cua triet) OR (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((nang xa) OR (lang van)) hoi. thien van dau duc va hanh vai ((cua triet) OR (cua viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((nang xa) or (lang van)) hoi. thien van dau duc va hanh vai ((cua triet) OR (cua viet))".
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((nang xa) or (lang van)) hoi. thien van dau duc va hanh vai ((cua triet) OR (cua viet))*.