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

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 (hoi hoi))) or (hoc hoi)). hieu ve cam tuc van hanh ve ca viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky nang ((((ho hoi) OR (hoi hoi))) OR (hoc hoi)). hieu ve cam tuc van hanh ve ca viet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ky nang ((((ho hoi) OR (hoi hoi))) or (hoc hoi)). hieu ve cam tuc van hanh ve ca viet*".