Perhaps you should try some spelling variations:
dang xay » dang van, van xay
su triet » su viet, su tien, ve triet
tu sach » thu sach, su sach, te sach
hieu ve » hieu van
hieu va » lieu va, hieu qua
cam duc » cam xuc, cao duc, pham duc
va hanh » van hanh, va thanh, va danh
hanh va » hang va, hanh vi

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 ((dang xay) OR (nang x)) hoi. ((hieu ve) OR (hieu va)) cam duc va hanh va su triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y ((dang xay) or (nang x)) hoi. ((hieu ve) OR (hieu va)) cam duc va hanh va su triet~".
• Adding a wildcard symbol may retrieve word variants: tu sach y ((dang xay) or (nang x)) hoi. ((hieu ve) OR (hieu va)) cam duc va hanh va su triet*.