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

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 ((van 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 ((van hanh) or (va thanh)) hoi va triet*.