Perhaps you should try some spelling variations:
doan manh » doan minh, hoang manh, tran manh
dan manh » dang manh, van manh, day manh
tu sach » thu sach, su sach, te sach
na thuc » nam thuc, na thuoc, va thuc
hieu le » hieu ve, hieu he, hieu ly
y nang » ky nang, ly nang, v nang
vai co » mai co, voi co
tai co » mai co, tai so, tri co
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: tu sach y nang x hoi. hieu le na thuc ((dan manh) or (doan manh)) ((vai co) OR (tai co)) viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang x hoi. hieu le na thuc ((dan manh) OR (doan manh)) ((vai co) OR (tai co)) viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang x hoi. hieu le na thuc ((dan manh) or (doan manh)) ((vai co) OR (tai co)) viet".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang x hoi. hieu le na thuc ((dan manh) or (doan manh)) ((vai co) OR (tai co)) viet*.