Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
tang van » dang van, hoang van, trong van
cham loc » cham soc, chon loc, cham o
hieu vu » hieu va, hieu ve, hieu su
vu cham » va cham, vu kham, tu cham
va dinh » van dinh, va tinh, vu dinh
va kinh » va tinh, qua kinh
du cua » duy cua, dau cua, dum cua
cua tu » cua tuc, cua su, cua cu

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: thuoc sach y ((mang may) OR (tang van)) hoi. hieu vu cham loc ((va dinh) OR (va kinh)) du cua tu~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach y ((mang may) or (tang van)) hoi. hieu vu cham loc ((va dinh) OR (va kinh)) du cua tu~".
• Adding a wildcard symbol may retrieve word variants: thuoc sach y ((mang may) or (tang van)) hoi. hieu vu cham loc ((va dinh) OR (va kinh)) du cua tu*.