Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
dan thanh » dang thanh, danh thanh, ban thanh
nam thuoc » nam thu, nha thuoc, cay thuoc
thu sach » tu sach, thuat sach, thuoc sach
nam thuc » am thuc, nam thu, nam tu
tai cuu » tai cuc, tai buu, tai cua
hieu ha » hieu hoa, hieu va, hieu ca
sach ty » sach y, sach tu, sach thu
nang ma » tang ma, sang ma, nang cao
cuu tre » cua tre, cau tren, cau treo

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 ty ((nang ma) OR (nang x)) hoi. hieu ha ((nam thuc) OR (nam thuoc)) dan thanh tai cuu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ty ((nang ma) or (nang x)) hoi. hieu ha ((nam thuc) OR (nam thuoc)) dan thanh tai cuu tre~".
• Adding a wildcard symbol may retrieve word variants: thu sach ty ((nang ma) or (nang x)) hoi. hieu ha ((nam thuc) OR (nam thuoc)) dan thanh tai cuu tre*.