Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
cham xuc » cam xuc, chat xuc, cham soc
kho tang » cao tang
lai hoi » dai hoi, lai hoa, lai roi
hieu ve » hieu va, hieu van
ky sang » ky nang, ky dang, ky tang
vai cau » van cau, vai cac, lai chau
ve cham » va cham, ve chat, vu cham
xuc va » duc va, tuc va, luc va
va dan » ca dan, va dao, va dau
va cau » van cau, va cac, va dau

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 (kho tang)) lai hoi. hieu ve cham xuc va dan ((vai cau) OR (va cau)) tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((ky sang) OR (kho tang)) lai hoi. hieu ve cham xuc va dan ((vai cau) OR (va cau)) tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((ky sang) or (kho tang)) lai hoi. hieu ve cham xuc va dan ((vai cau) OR (va cau)) tren".
• Adding a wildcard symbol may retrieve word variants: thu sach ((ky sang) or (kho tang)) lai hoi. hieu ve cham xuc va dan ((vai cau) OR (va cau)) tren*.