Perhaps you should try some spelling variations:
sach duoc » sach nuoc, sach dung, sinh duoc
hanh lam » thanh lap, hanh kem, hanh va
sach dao » lanh dao
lam cua » nam cua, lam chat
va hanh » van hanh, va thanh, va danh
ve cham » va cham, ve chat, vu cham
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi
soc va » hoc va, loc va, doc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach dao) or (sach duoc)) sang ((mai hoi) or (ma hoa)). hieu ve cham soc va hanh lam cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach dao) OR (sach duoc)) sang ((mai hoi) OR (ma hoa)). hieu ve cham soc va hanh lam cua tre.
• Adding a wildcard symbol may retrieve word variants: tu ((sach dao) or (sach duoc)) sang ((mai hoi) or (ma hoa)). hieu ve cham soc va hanh lam cua tre*.