Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
thu nang » thi nang, thu hang, thu bang
cham xuc » cam xuc, chat xuc, cham soc
tu sach » thu sach, su sach, te sach
cua tre » cua te, cuu tre, cua triet
ban anh » ban hanh, ban banh, ban danh
xuc ban » duc ban, cuc ban, quoc ban
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
anh ve » hanh ve, anh va, anh viet
cua su » qua su
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 thu nang ((x hoi) OR (o hoi)). hieu ve cham xuc ban anh ve ((cua tre) or (cua su))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thu nang ((x hoi) OR (o hoi)). hieu ve cham xuc ban anh ve ((cua tre) OR (cua su)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach thu nang ((x hoi) OR (o hoi)). hieu ve cham xuc ban anh ve ((cua tre) or (cua su))".
• Adding a wildcard symbol may retrieve word variants: tu sach thu nang ((x hoi) OR (o hoi)). hieu ve cham xuc ban anh ve ((cua tre) or (cua su))*.