Perhaps you should try some spelling variations:
nhan luc » nang luc
tu sach » thu sach, su sach, te sach
van cau » van dau, van hau, van chat
va danh » va dinh, va dan, va hanh
do nhan » doi nhan, do nhat, de nhan
hieu do » hieu so, hieu bo, bieu do
ty hang » ly hang, thi hang, thu hang
luc va » duc va, tuc va, loc va
va cau » va cac, va dau, va cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ((ty xang) or (ty hang)) xa hoi. hieu do nhan luc va danh ((va cau) OR (van cau)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ty xang) OR (ty hang)) xa hoi. hieu do nhan luc va danh ((va cau) OR (van cau)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ty xang) or (ty hang)) xa hoi. hieu do nhan luc va danh ((va cau) OR (van cau)) tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ty xang) or (ty hang)) xa hoi. hieu do nhan luc va danh ((va cau) OR (van cau)) tre*.