Perhaps you should try some spelling variations:
hang doi » hang di, huong doi, hang tai
hieu cua » hieu qua, dieu cua, bieu cua
cua nhan » ca nhan, cua ngan, cua nha
nhan luc » nang luc
hang loi » thang loi, tang loi, thanh loi
su sach » so sach, vu sach
cuu tre » cua tre, cau tren, cau treo
sach ky » sac ky, sach y, sach ty
luc va » duc va, tuc va, loc va
nang o » nang co, nang ho, nang ro
cua te » cua tu
o hoi » co hoi, o hoc, o hai

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

• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang o hoi. hieu cua nhan luc va ((hang doi) OR (hang loi)) ((cuu tre) OR (cua te))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang o hoi. hieu cua nhan luc va ((hang doi) OR (hang loi)) ((cuu tre) or (cua te))~".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang o hoi. hieu cua nhan luc va ((hang doi) OR (hang loi)) ((cuu tre) or (cua te))*.