Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
dau tren » dau tien, dat tren, dau tieng
may hoi » may thoi, tay hoi, mai hoi
hieu va » lieu va, hieu qua
xuc van » duc van, luc van, vuc van
luu van » cuu van, luan van, luu hanh
y mang » cay mang
anh vi » hanh vi, anh va, anh ve
vi dau » vi dai, va dau, bi dau

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 y mang may hoi. hieu va cac ((xuc van) or (luu van)) anh vi dau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach y mang may hoi. hieu va cac ((xuc van) OR (luu van)) anh vi dau tren.
• Adding a wildcard symbol may retrieve word variants: thuoc sach y mang may hoi. hieu va cac ((xuc van) or (luu van)) anh vi dau tren*.