Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
thu nang » thi nang, thu hang, thu bang
tu sach » thu sach, su sach, te sach
hieu va » hieu qua
cam cuc » cam xuc, cham cuu, pham cuc
cuc ban » cua ban, cac ban, cuu ban
cua tre » cua te, cuu tre, cua triet
danh d » danh di, danh du, danh o

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: tu sach thu nang x ho. ((hieu va) OR (lieu va)) cam cuc ban ((danh d) OR (anh d)) cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach thu nang x ho. ((hieu va) or (lieu va)) cam cuc ban ((danh d) OR (anh d)) cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu sach thu nang x ho. ((hieu va) or (lieu va)) cam cuc ban ((danh d) OR (anh d)) cua tre*.