Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
cau tren » cu tren, dau tren, ca tren
ky tang » ky nang, ky dang, kho tang
lai hoi » dai hoi, lai hoa, lai roi
ky sang » ky nang, ky dang, duy sang
dan vai » dan va, dan tai, dan vat
vai cau » va cau, van cau, vai cac
va cam » va cham, va cac, va cao
xuc va » duc va, tuc va, luc va
va dan » ca dan, va dao, va dau
ve cam » ve cham, ve cac, ve cai

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 cam)) xuc va dan vai cau 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 cam)) xuc va dan vai cau tren.
• Adding a wildcard symbol may retrieve word variants: thu sach ((ky sang) or (ky tang)) lai hoi. hieu ((ve cam) or (va cam)) xuc va dan vai cau tren*.