Perhaps you should try some spelling variations:
hieu quan » lieu quan, thien quan, lien quan
nhan luc » nang luc
lang van » dang van, tang van, hoang van
va hanh » van hanh, va thanh, va danh
su sach » so sach, vu sach
van hoi » van hoa, van hoc, van hoe
sach o » sach lo, sac o, sach y
luc va » duc va, tuc va, loc va
o lang » hoa lang, hoi lang
di cua » dai cua, doi cua, do cua
de cua » le cua, te cua, dieu cua

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