Perhaps you should try some spelling variations:
hoc khoi » hoc khoa, hoc hoa, hoc noi
van hanh » van thanh, ban hanh, van anh
hanh de » hanh ve, hanh kem
tuc van » thuc van, truc van, tuc va
cac tuc » cac toc, cac tu, cac tac
hieu ve » hieu va, hieu van
ca viet » va viet, co viet, hoa viet
hoa hoi » khoa hoi, hoa hoc, hoa doi
sac ky » cac ky, sai ky
ve cac » va cac, vien cac
ho hoi » hoc hoi, hoi hoi, co hoi
su sac » su sach, su cac, su xac
de ca » de cua, de cai, de cac

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