Perhaps you should try some spelling variations:
manh hang » manh thang, manh hung, minh hang
cham duc » pham duc, cham soc, pham duy
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
tu sach » thu sach, su sach, te sach
cuu tre » cau tren, cau treo
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
cua tre » cua te, cua triet, dua tren

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

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