Perhaps you should try some spelling variations:
mai khoi » mai khoa, tai khoa, dai khoa
cac khoi » cac thoi, cac khoan, cach thoi
hieu van » hieu va, thien van, hieu ve
hanh vai » hanh vi, hanh va, hanh tai
ky tang » ky nang, ky dang, kho tang
cao duc » dao duc, cao suc, giao duc
va hanh » van hanh, va thanh, va danh
vai cuu » vai cua
cuu tre » cua tre, cau tren, cau treo

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu cac ky tang ((mai khoi) or (cac khoi)). ((hieu van) OR (lieu va)) cao duc va hanh vai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cac ky tang ((mai khoi) OR (cac khoi)). ((hieu van) OR (lieu va)) cao duc va hanh vai cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cac ky tang ((mai khoi) or (cac khoi)). ((hieu van) OR (lieu va)) cao duc va hanh vai cuu tre".
• Adding a wildcard symbol may retrieve word variants: tu cac ky tang ((mai khoi) or (cac khoi)). ((hieu van) OR (lieu va)) cao duc va hanh vai cuu tre*.