Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
thanh ve » hanh ve, thanh va, thanh vien
hieu van » hieu va, thien van, lieu va
va thanh » gia thanh, ban thanh, va tinh
cau treo » cau theo, cau tren, cau triet
tang ma » mang may, tang van
van cam » van nam, van lam, van cau
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren
ma hoi » mai hoi, xa hoi, ma hoa
cam tu » cam thu, nam tu, dam tu
sach 7 » sach y, sach 2
7 tang » 6 tang

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 7 tang ma hoi. hieu van cam tu va thanh ve ((((cua tre) OR (cuu tre))) or (cau treo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach 7 tang ma hoi. hieu van cam tu va thanh ve ((((cua tre) OR (cuu tre))) OR (cau treo)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach 7 tang ma hoi. hieu van cam tu va thanh ve ((((cua tre) OR (cuu tre))) or (cau treo))".
• Adding a wildcard symbol may retrieve word variants: thuoc sach 7 tang ma hoi. hieu van cam tu va thanh ve ((((cua tre) OR (cuu tre))) or (cau treo))*.