Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
sach thu » sach thue, sach thieu, sach tham
phat duc » pham duc, phan duc, phan duoc
hanh lai » hanh lam, hanh tai, thanh lap
va triet » va thiet, va trien, ve triet
sang ma » tang ma, nang ma, sang tao
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
lai va » loai va, mai va, dai va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach thu ((sang ma) or (mang may)) hoi. hieu va phat duc va hanh lai va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach thu ((sang ma) OR (mang may)) hoi. hieu va phat duc va hanh lai va triet.
• Adding a wildcard symbol may retrieve word variants: thu sach thu ((sang ma) or (mang may)) hoi. hieu va phat duc va hanh lai va triet*.