Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
thu hang » thi hang, thu huong, thu trang
hieu van » hieu va, thien van, lieu va
van chao » van chat, van hao, van cho
thanh vi » hanh vi, thanh va, thanh ve
cua tre » cua te, cuu tre, cua triet
xu van » vu van, su van
tu van » tu va
vi cua » vai cua, di cua

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: thu sach ((thu hang) OR (thuc hanh)) xa hoi. hieu van chao ((xu van) OR (tu van)) thanh vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((thu hang) OR (thuc hanh)) xa hoi. hieu van chao ((xu van) or (tu van)) thanh vi cua tre~".
• Adding a wildcard symbol may retrieve word variants: thu sach ((thu hang) OR (thuc hanh)) xa hoi. hieu van chao ((xu van) or (tu van)) thanh vi cua tre*.