Perhaps you should try some spelling variations:
sach tham » sach nha
tham tang » nham tang, thai tang, tham lang
va triet » va thiet, va trien, ve triet
hanh lam » thanh lap, hanh kem, hanh va
va hanh » van hanh, va thanh, va danh
va chat » van chat, va phat, cao chat
so sach » so sanh, bo sach, co sach
mai hoi » mai khoi, dai hoi, lai hoi
ve cham » va cham, ve chat, vu cham
lam va » nam va, dam va, lam ha

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach tham tang ((mai hoi) or (xa hoi)). hieu ((ve cham) or (va chat)) duc va hanh lam va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach tham tang ((mai hoi) OR (xa hoi)). hieu ((ve cham) OR (va chat)) duc va hanh lam va triet.
• Adding a wildcard symbol may retrieve word variants: so sach tham tang ((mai hoi) or (xa hoi)). hieu ((ve cham) or (va chat)) duc va hanh lam va triet*.