Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
van hanh » van thanh, ban hanh, van anh
ve triet » va trien, su triet
tang ma » tang van
hieu va » lieu va, hieu qua
lam luu » tam luu
luu van » cuu van, luan van, luu hanh
hanh de » hanh ve, hanh kem
va lam » van lam, va lap

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) or (tang ma)) hoi. hieu va lam luu van hanh de ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach y ((mang may) OR (tang ma)) hoi. hieu va lam luu van hanh de ve triet.
• Adding a wildcard symbol may retrieve word variants: thuoc sach y ((mang may) or (tang ma)) hoi. hieu va lam luu van hanh de ve triet*.