Perhaps you should try some spelling variations:
khoa viet » khoan viet, hoa viet, thoai viet
mai khoi » tai khoa, cac khoi, dai khoa
voi khoa » noi khoa, hoi khoa, loi khoa
hanh voi » hanh vi, hanh noi, hanh moi
mai khoa » tai khoa, may khoa, dai khoa
van hanh » van thanh, ban hanh, van anh
xuc van » duc van, luc van, vuc van
va cam » va cham, va cac, va cao
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky
ve cai » va cai, ve cac, ve tai

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 ((mai khoi) OR (mai khoa)). hieu ((ve cai) or (va cam)) xuc van hanh voi khoa viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky nang ((mai khoi) OR (mai khoa)). hieu ((ve cai) OR (va cam)) xuc van hanh voi khoa viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ky nang ((mai khoi) OR (mai khoa)). hieu ((ve cai) or (va cam)) xuc van hanh voi khoa viet".
• Adding a wildcard symbol may retrieve word variants: su sac ky nang ((mai khoi) OR (mai khoa)). hieu ((ve cai) or (va cam)) xuc van hanh voi khoa viet*.