Perhaps you should try some spelling variations:
hanh gian » thanh gian, thanh giang, manh giang
thu sach » tu sach, thuat sach, thuoc sach
thu nang » thi nang, thu hang, thu bang
gian cua » gian xu, ban cua
cham hoc » cham soc, chat hoc, cham hoi
sach thu » sach thue, sach thieu, sach tham
ve cham » va cham, ve chat, vu cham
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
lai hoi » dai hoi, lai hoa, lai roi
mai hoi » mai khoi, dai hoi, mai doi

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 nang ((((mai hoi) or (lai hoi))) or (ma hoa)). hieu ve cham hoc va hanh gian cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach thu nang ((((mai hoi) OR (lai hoi))) OR (ma hoa)). hieu ve cham hoc va hanh gian cua tre.
• Adding a wildcard symbol may retrieve word variants: thu sach thu nang ((((mai hoi) or (lai hoi))) or (ma hoa)). hieu ve cham hoc va hanh gian cua tre*.