Perhaps you should try some spelling variations:
thuyet triet » thuyet thiet, thuyet trinh, thuyet viet
van thuyet » van chuyet, van thuyen, van tuyet
hanh van » thanh van, khanh van, hanh va
ban hanh » ban hang
xuc ban » duc ban, cuc ban, quoc ban
sach ty » sach y, sach tu, sach thu
vu sach » vu bach, su sach, vu khach
va cam » va cham, va cac, va cao
ro hoi » co hoi, mo hoi, ro doi
ve cam » ve cham, ve cac, ve cai
o hoi » co hoi, o hoc, o hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ty xang ((ro hoi) or (o hoi)). hieu ((ve cam) or (va cam)) xuc ban hanh van thuyet triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ty xang ((ro hoi) OR (o hoi)). hieu ((ve cam) OR (va cam)) xuc ban hanh van thuyet triet.
• Adding a wildcard symbol may retrieve word variants: vu sach ty xang ((ro hoi) or (o hoi)). hieu ((ve cam) or (va cam)) xuc ban hanh van thuyet triet*.