Perhaps you should try some spelling variations:
tran manh » tran minh, tran thanh, tran van
nam thuc » nam thuoc, am thuc, nam thu
hieu van » hieu va, thien van, lieu va
dan manh » dang manh, doan manh, van manh
tu sach » thu sach, su sach, te sach
co viet » so viet, o viet, hoc viet
sach ky » sac ky, sach y, sach ty
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 ky nang ((x hoi) or (o hoi)). hieu van nam thuc ((dan manh) or (tran manh)) vai co viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((x hoi) OR (o hoi)). hieu van nam thuc ((dan manh) OR (tran manh)) vai co viet.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((x hoi) or (o hoi)). hieu van nam thuc ((dan manh) or (tran manh)) vai co viet*.