Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
danh van » doanh van, dang van, dinh van
dau tren » dau tien, dat tren, dau tieng
ky tang » ky nang, ky dang, kho tang
lai hoi » dai hoi, lai hoa, lai roi
va danh » va dinh, va dan, va hanh
ky sang » ky nang, ky dang, duy sang
van dau » van dao, phan dau
va cao » va cac, va co, va dao
xuc va » duc va, tuc va, luc va
ve cam » ve cham, ve cac, va cam

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 ((ky sang) or (ky tang)) lai hoi. hieu ((ve cam) or (va cao)) xuc va danh van dau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((ky sang) OR (ky tang)) lai hoi. hieu ((ve cam) OR (va cao)) xuc va danh van dau tren.
• Adding a wildcard symbol may retrieve word variants: thu sach ((ky sang) or (ky tang)) lai hoi. hieu ((ve cam) or (va cao)) xuc va danh van dau tren*.