Perhaps you should try some spelling variations:
doanh ban » doanh bat, doanh van, doanh nhan
cham luc » cham soc, nhan luc, cham cuu
tu sach » thu sach, su sach, te sach
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
ly nang » ky nang, ly hang, ly vang
sach ly » sach y, sach lo, sach ty
cua tre » cua te, cuu tre, cua triet
luc va » duc va, tuc va, loc va
o hoi » co hoi, o hoc, o hai
x hoi » xa hoi, x ho, 5 hoi

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 ly nang ((x hoi) OR (o hoi)). hieu ve cham luc va ((dinh van) or (doanh ban)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ly nang ((x hoi) OR (o hoi)). hieu ve cham luc va ((dinh van) OR (doanh ban)) cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ly nang ((x hoi) OR (o hoi)). hieu ve cham luc va ((dinh van) or (doanh ban)) cua tre*".