Perhaps you should try some spelling variations:
doan manh » doan minh, hoang manh, tran manh
thu sach » tu sach, thuat sach, thuoc sach
dan manh » dang manh, van manh, day manh
hieu le » hieu ve, hieu he, hieu ly
co viet » so viet, hoc viet, hoa viet
na thuc » nam thuc, na thuoc, va thuc
y nang » ky nang, ly nang, v nang
o viet » so viet, hoc viet
le na » le nam, le va, le ta
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach y nang x hoi. hieu le na thuc ((dan manh) or (doan manh)) vai ((co viet) or (o viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y nang x hoi. hieu le na thuc ((dan manh) OR (doan manh)) vai ((co viet) OR (o viet)).
• Adding a wildcard symbol may retrieve word variants: thu sach y nang x hoi. hieu le na thuc ((dan manh) or (doan manh)) vai ((co viet) or (o viet))*.