Perhaps you should try some spelling variations:
hanh thai » nhanh thai, hinh thai, hanh tai
va trien » va truyen, va thiet, va tuyen
va triet » va thiet, ve triet, cua triet
ban hanh » ban hang
tuc ban » thuc ban, truc ban, tu ban
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
ky dang » ky nang, ky danh
cac tuc » cac toc, cac tu, cac tac
ve cac » va cac, vien cac
ky anh » ky danh, ly anh, ty anh

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 ((ky dang) OR (ky anh)) xa hoi. hieu ve cac tuc ban hanh thai ((va triet) OR (va trien))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ky dang) or (ky anh)) xa hoi. hieu ve cac tuc ban hanh thai ((va triet) OR (va trien))~".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ky dang) or (ky anh)) xa hoi. hieu ve cac tuc ban hanh thai ((va triet) OR (va trien))*.