Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
ban thanh » ban hanh, ban hang
thanh lai » thanh hai, thanh lap, thanh loi
sach thi » sach thu, sach tai, sach thieu
thi nang » thi cong, ki nang, thi hanh
chat duc » chat xuc, chat doc, chet duoc
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu va, hieu van
ve chat » va chat, van chat
duc ban » duc tan, duc van, dua ban
su tien » su kien, su hien, tu tieng
ma hoi » xa hoi, ma hoa, me hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach thi nang ((ma hoi) or (mai hoi)). hieu ve chat duc ban thanh lai su tien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach thi nang ((ma hoi) OR (mai hoi)). hieu ve chat duc ban thanh lai su tien*.