Perhaps you should try some spelling variations:
mai khoi » mai khoa, tai khoa, dai khoa
dinh vai » dinh van, dinh vi, dinh va
cac khoi » cac thoi, cac khoan, cach thoi
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
vai cuu » vai cua
va dinh » van dinh, va kinh, va tinh
cam duc » cam xuc, cao duc, pham duc
cuu tre » cua tre, cau tren, cau treo
sach ky » sac ky, sach y, sach ty
hieu ve » hieu van

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky nang ((mai khoi) OR (cac khoi)). ((hieu ve) or (hieu va)) cam duc va dinh vai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ((mai khoi) OR (cac khoi)). ((hieu ve) OR (hieu va)) cam duc va dinh vai cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang ((mai khoi) OR (cac khoi)). ((hieu ve) or (hieu va)) cam duc va dinh vai cuu tre*".