Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
dang xay » dang van, van xay
va thanh » gia thanh, ban thanh, va tinh
sach ky » sac ky, sach y, sach ty
va hanh » van hanh, va danh, ban hanh
so sach » so sanh, bo sach, co sach
cau tuc » cau truc, cau luc, cau phuc
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky nang, ky danh
cau tu » dau tu, cau truc

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: so sach ky dang xay hoi. hieu qua ((cau tuc) OR (cau tu)) ((va hanh) OR (va thanh)) hoi va triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky dang xay hoi. hieu qua ((cau tuc) OR (cau tu)) ((va hanh) or (va thanh)) hoi va triet~".
• Adding a wildcard symbol may retrieve word variants: so sach ky dang xay hoi. hieu qua ((cau tuc) OR (cau tu)) ((va hanh) or (va thanh)) hoi va triet*.