Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
nam thuc » nam thuoc, am thuc, nam thu
van hanh » van thanh, ban hanh, van anh
hoc khoi » hoc khoa, hoc hoa, hoc noi
hanh le » thanh le, hanh ve, hanh de
hieu ve » hieu va, hieu van
cam tuc » cam xuc, cam tu, dam thuc
le cua » ly cua
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky
ho hoi » hoc hoi, hoa hoi, hoi hoi

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sac ky nang ((ho hoi) or (hoc khoi)). hieu ve ((cam tuc) OR (nam thuc)) van hanh le cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky nang ((ho hoi) OR (hoc khoi)). hieu ve ((cam tuc) OR (nam thuc)) van hanh le cua viet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ky nang ((ho hoi) or (hoc khoi)). hieu ve ((cam tuc) OR (nam thuc)) van hanh le cua viet*".