Perhaps you should try some spelling variations:
hoc khoi » hoc khoa, hoc hoa, hoc noi
van hanh » van thanh, ban hanh, van anh
cua viet » ca viet, hoa viet, cua vat
hoc hoi » hoc hoa, hoc noi, hoc moi
hieu ve » hieu va, hieu van
cam tuc » cam xuc, cam tu, nam thuc
tuc van » thuc van, truc van, tuc va
hanh ve » hanh vi, hanh va, hanh kem
ho hoi » hoa hoi, hoi hoi, co hoi
sac ky » cac ky, sai ky
ve cam » ve cham, ve cac, va cam
ve cua » le cua, de cua, te cua
su sac » su sach, su cac, su xac

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) OR (hoc khoi)))). hieu ve cam tuc 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) OR (hoc khoi)))). hieu ve cam tuc 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) OR (hoc khoi)))). hieu ve cam tuc van hanh ve cua viet*".