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
hanh ve » hanh vi, hanh va, hanh kem
hoc hoi » hoc khoi, hoc hoa, hoc noi
hieu ve » hieu va, hieu van
cam tuc » cam xuc, cam tu, dam thuc
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

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 hoi)). hieu ve ((cam tuc) OR (nam thuc)) van hanh ve cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky nang ((ho hoi) OR (hoc hoi)). hieu ve ((cam tuc) OR (nam thuc)) van 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 ((cam tuc) OR (nam thuc)) van hanh ve cua viet*".