Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
ban hang » ngan hang
sang lai » sang tai, sang lap, mang lai
tu sach » su sach, te sach, tu cach
cam tuc » cam xuc, cam tu, nam thuc
bai cua » ban cua, bai ca, hai cua
tuc ban » thuc ban, truc ban, tu ban
hieu ve » hieu va, hieu van
lai roi » lai hoi, loi roi
ky sang » ky nang, ky dang, ky tang
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: ((tu sach) or (thu sach)) ky sang lai roi. hieu ve cam tuc ban hang ((bai cua) or (dai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky sang lai roi. hieu ve cam tuc ban hang ((bai cua) OR (dai cua)) tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ky sang lai roi. hieu ve cam tuc ban hang ((bai cua) or (dai cua)) tre*.