Perhaps you should try some spelling variations:
doan minh » doan hinh, doan tinh, hoang minh
nam thuc » nam thuoc, am thuc, nam thu
dan manh » dang manh, doan manh, van manh
tu sach » thu sach, su sach, te sach
co viet » so viet, o viet, hoc viet
hieu le » hieu ve, hieu he, hieu ly
le nam » ly nam, he nam, le na
y nang » ky nang, ly nang, v nang
vai co » mai co, tai co, voi co
o hoi » co hoi, o hoc, o hai
x hoi » xa hoi, x ho, 5 hoi

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 y nang ((x hoi) OR (o hoi)). hieu le nam thuc ((dan manh) or (doan minh)) vai co viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang ((x hoi) OR (o hoi)). hieu le nam thuc ((dan manh) OR (doan minh)) vai co viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang ((x hoi) OR (o hoi)). hieu le nam thuc ((dan manh) or (doan minh)) vai co viet".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ((x hoi) OR (o hoi)). hieu le nam thuc ((dan manh) or (doan minh)) vai co viet*.