Perhaps you should try some spelling variations:
cua triet » su triet, va triet
van hanh » van thanh, ban hanh, van anh
cua viet » ca viet, hoa viet, cua vat
sach ty » sach tu, sach thu, xach tay
lang xa » lang ha, dang xay, lang van
qua hai » qua hoat
hai tuc » thai tuc, hai cuc, thai thuc
tuc van » thuc van, truc van, tuc 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: co ((sach ty) OR (sach y)) lang xa hoi. hieu qua hai tuc van hanh vi ((cua triet) OR (cua viet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "co ((sach ty) or (sach y)) lang xa hoi. hieu qua hai tuc van hanh vi ((cua triet) OR (cua viet))~".
• Adding a wildcard symbol may retrieve word variants: co ((sach ty) or (sach y)) lang xa hoi. hieu qua hai tuc van hanh vi ((cua triet) OR (cua viet))*.