Perhaps you should try some spelling variations:
hieu quan » lieu quan, thien quan, lien quan
nhan luc » nang luc
hanh di » hanh vi, hanh de, hang di
va hanh » van hanh, va thanh, va danh
su sach » so sach, vu sach
van hoi » van hoa, van hoc, van hoe
do tang » de tang, do dang, cao tang
luc va » duc va, tuc va, loc va
o tang » 6 tang, 7 tang, 5 tang
di cua » dai cua, doi cua, de cua
cua te » cua tu

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 ((o tang) OR (do tang)) van hoi. ((hieu quan) OR (hieu qua)) nhan luc va hanh di cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((o tang) OR (do tang)) van hoi. ((hieu quan) or (hieu qua)) nhan luc va hanh di cua te~".
• Adding a wildcard symbol may retrieve word variants: su sach ((o tang) OR (do tang)) van hoi. ((hieu quan) or (hieu qua)) nhan luc va hanh di cua te*.