Perhaps you should try some spelling variations:
tri nang » thi nang, tra nang, tri bang
ban hanh » ban hang
hieu van » hieu va, thien van, lieu va
sach tri » sach tai, sach tren, sach truc
tu sach » thu sach, su sach, te sach
cuc ban » cua ban, cac ban, cuu ban
doi cua » dai cua, hoi cua
van cau » van dau, van hau, van chat
cau cuc » cau cua, cau luc, cau truc
di cua » dai cua, de cua, do cua

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 tri nang ((ma hoa) or (xa hoi)). hieu van cau cuc ban hanh ((di cua) or (doi cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tri nang ((ma hoa) OR (xa hoi)). hieu van cau cuc ban hanh ((di cua) OR (doi cua)) tre.
• Adding a wildcard symbol may retrieve word variants: tu sach tri nang ((ma hoa) or (xa hoi)). hieu van cau cuc ban hanh ((di cua) or (doi cua)) tre*.