Perhaps you should try some spelling variations:
manh hang » manh thang, manh hung, minh hang
mai khoi » mai khoa, tai khoa, dai khoa
hang tai » hang va, dung tai
cac khoi » cac thoi, cac khoan, cach thoi
duc manh » suc manh, duc anh, duc minh
cham duc » pham duc, cham soc, pham duy
su sach » so sach, vu sach
tai cuu » tai cuc, tai buu, tai cua
cuu tre » cua tre, cau tren, cau treo
hieu va » lieu va, hieu qua
sach ky » sac ky, sach y, sach ty
hieu ve » hieu van
ky lang » ky nang, ky dang, ky tang

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 lang ((mai khoi) or (cac khoi)). ((hieu ve) OR (hieu va)) cham duc manh hang tai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky lang ((mai khoi) OR (cac khoi)). ((hieu ve) OR (hieu va)) cham duc manh hang tai cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky lang ((mai khoi) or (cac khoi)). ((hieu ve) OR (hieu va)) cham duc manh hang tai cuu tre".
• Adding a wildcard symbol may retrieve word variants: su sach ky lang ((mai khoi) or (cac khoi)). ((hieu ve) OR (hieu va)) cham duc manh hang tai cuu tre*.