Perhaps you should try some spelling variations:
hang hai » hoang hai, hang tai, thanh hai
van hang » van khang, van hoang, van thang
truc van » truc va, thuc van, truc ban
cac truc » cau truc, cac tru, cac trung
so sach » so sanh, bo sach, co sach
qua cac » cua cac
so tien » so tin, su tien, so bien
y nang » ky nang, ly nang, v nang
hai so » dai so, tai so, thai son
co hai » co dai, co hoi, so hai
o hai » so hai, o lai, _ hai
o hoi » co hoi, o hoc, o hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach y nang ((o hoi) or (((o hai) or (co hai)))). hieu qua cac truc van hang hai so tien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y nang ((o hoi) OR (((o hai) OR (co hai)))). hieu qua cac truc van hang hai so tien.
• Adding a wildcard symbol may retrieve word variants: so sach y nang ((o hoi) or (((o hai) or (co hai)))). hieu qua cac truc van hang hai so tien*.