Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
thu nang » thi nang, thu hang, thu bang
ban hanh » ban hang
sach thu » sach thue, sach thieu, sach tham
cam duc » cam xuc, cao duc, pham duc
hoi cua » hoi chuc
lai cua » dai cua, hai cua, lai chau
duc ban » duc tan, duc van, dua ban
hieu va » lieu va, hieu qua
mai hoi » mai khoi, dai hoi, lai hoi
va cam » va cham, va cac, va cao
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: thu sach thu nang ((ma hoi) or (mai hoi)). hieu va cam duc ban hanh ((lai cua) or (hoi cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach thu nang ((ma hoi) OR (mai hoi)). hieu va cam duc ban hanh ((lai cua) OR (hoi cua)) te.
• Adding a wildcard symbol may retrieve word variants: thu sach thu nang ((ma hoi) or (mai hoi)). hieu va cam duc ban hanh ((lai cua) or (hoi cua)) te*.