Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
va doanh » van doanh, vay doanh, va danh
cau treo » cau theo, cau tren, cau triet
nang ma » tang ma, nang cao, mang may
sang ma » tang ma, sang tao, mang may
sach ky » sac ky, sach y, sach ty
cac xuc » cam xuc, cac nuoc, chat xuc
cuu tre » cua tre, cau tren
hieu ve » hieu va, hieu van
ve cac » va cac, vien cac
xuc va » duc va, tuc va, luc va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach ky ((sang ma) or (nang ma)) hoi. hieu ve cac xuc va doanh tai ((cuu tre) OR (cau treo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ky ((sang ma) OR (nang ma)) hoi. hieu ve cac xuc va doanh tai ((cuu tre) OR (cau treo)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ky ((sang ma) or (nang ma)) hoi. hieu ve cac xuc va doanh tai ((cuu tre) OR (cau treo))".
• Adding a wildcard symbol may retrieve word variants: thuoc sach ky ((sang ma) or (nang ma)) hoi. hieu ve cac xuc va doanh tai ((cuu tre) OR (cau treo))*.