Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
thu nang » thi nang, thu hang, thu bang
qua nhan » cua nhan, qua nhat, qua phan
nhan luc » nang luc
hanh doi » thanh doi, hanh noi, hang doi
su sach » so sach, vu sach
va hanh » van hanh, va thanh, va danh
cuu tre » cua tre, cau tren, cau treo
luc va » duc va, tuc va, loc va
cua tu » cua tuc, cua su, cua cu
x hoi » xa hoi, o hoi, 5 hoi

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 thu nang ((x hoi) OR (x ho)). hieu qua nhan luc va hanh doi ((cuu tre) OR (cua tu))~.
• Adding a wildcard symbol may retrieve word variants: su sach thu nang ((x hoi) or (x ho)). hieu qua nhan luc va hanh doi ((cuu tre) or (cua tu))*.