Perhaps you should try some spelling variations:
mai khoi » mai khoa, tai khoa, dai khoa
cac khoi » cac thoi, cac khoan, cach thoi
van hanh » van thanh, ban hanh, van anh
hieu ve » hieu va, hieu van
tai cuu » tai cuc, tai buu, tai cua
cuu tre » cua tre, cau tren, cau treo
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky
ve cam » ve cham, ve cac, va cam

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 (cac khoi)). hieu ve cam xuc ((van hanh) or (van minh)) tai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky nang ((mai khoi) OR (cac khoi)). hieu ve cam xuc ((van hanh) OR (van minh)) tai cuu tre.
• Adding a wildcard symbol may retrieve word variants: su sac ky nang ((mai khoi) or (cac khoi)). hieu ve cam xuc ((van hanh) or (van minh)) tai cuu tre*.