Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
vat hanh » vat thanh, van hanh, nhat hanh
nam thuc » nam thuoc, am thuc, nam thu
va hanh » van hanh, va thanh, va danh
hoc hoi » hoc khoi, hoc hoa, hoc noi
hieu ve » hieu va, hieu van
ve cua » le cua, de cua, te cua
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky
ho hoi » hoa hoi, hoi hoi, co hoi
ve nam » he nam, va nam, le nam

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: su sac ky nang ((ho hoi) OR (hoc hoi)). hieu ve nam thuc ((vat hanh) OR (va hanh)) ve cua viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ky nang ((ho hoi) or (hoc hoi)). hieu ve nam thuc ((vat hanh) OR (va hanh)) ve cua viet~".
• Adding a wildcard symbol may retrieve word variants: su sac ky nang ((ho hoi) or (hoc hoi)). hieu ve nam thuc ((vat hanh) OR (va hanh)) ve cua viet*.