Perhaps you should try some spelling variations:
cua triet » su triet, va triet
cua viet » ca viet, hoa viet, cua vat
hieu van » hieu va, thien van, lieu va
hanh va » hang va, hanh vi
va hanh » van hanh, va thanh, va danh
bao xuc » bao luc, bao thuc
tu sach » thu sach, su sach, te sach
tang ma » mang may, tang van
nang xa » nang x, lang xa, nang ma
van bao » van ban, van dao
xuc va » duc va, tuc va, luc 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: tu sach y ((nang xa) OR (tang ma)) hoi. hieu van bao xuc va hanh va ((cua triet) OR (cua viet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y ((nang xa) or (tang ma)) hoi. hieu van bao xuc va hanh va ((cua triet) OR (cua viet))~".
• Adding a wildcard symbol may retrieve word variants: tu sach y ((nang xa) or (tang ma)) hoi. hieu van bao xuc va hanh va ((cua triet) OR (cua viet))*.