Perhaps you should try some spelling variations:
chet triet » chuyen triet, thuyet triet
van chet » van chat, van chuyet, van chien
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 hoc » co hoc, mo hoc, so hoc
ve cam » ve cham, ve cac, ve cai
o hoc » co hoc, mo hoc, so hoc

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