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

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 (luc van)) anh vi ((dau tren) OR (dau tieng))~.
• 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 (luc van)) anh vi ((dau tren) OR (dau tieng)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach y mang may hoi. hieu va cac ((xuc van) or (luc van)) anh vi ((dau tren) OR (dau tieng))".
• Adding a wildcard symbol may retrieve word variants: thuoc sach y mang may hoi. hieu va cac ((xuc van) or (luc van)) anh vi ((dau tren) OR (dau tieng))*.