Perhaps you should try some spelling variations:
sach tren » sach tien, sach tranh
tren nang » trien nang, tren mang, truyen nang
thu sach » tu sach, thuat sach, thuoc sach
ban hanh » ban hang
cao hoi » co hoi, cao hoc, tao hoi
hieu va » lieu va, hieu qua
cac cuc » cac cuoc, cac cua, cac nuoc
cuc ban » cua ban, cac ban, cuu ban
doi cua » dai cua, hoi cua
do cua » co cua, de cua, dong cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach tren nang ((cao hoi) OR (cau hoi)). hieu va cac cuc ban hanh ((do cua) or (doi cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach tren nang ((cao hoi) OR (cau hoi)). hieu va cac cuc ban hanh ((do cua) OR (doi cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach tren nang ((cao hoi) OR (cau hoi)). hieu va cac cuc ban hanh ((do cua) or (doi cua)) tre".
• Adding a wildcard symbol may retrieve word variants: thu sach tren nang ((cao hoi) OR (cau hoi)). hieu va cac cuc ban hanh ((do cua) or (doi cua)) tre*.