Perhaps you should try some spelling variations:
cua quoc » cua nuoc, cua thuoc
thanh va » thanh van, hanh va, thanh ha
duc van » duc va, duc tan, duc manh
xuc ban » duc ban, cuc ban, quoc ban
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi
y lang » _ lang, tay lang, yen lang
ve cam » ve cham, ve cac, va cam
o lang » hoa lang, hoi lang
va cua » va chua, via cua, ca cua

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 ((y lang) OR (o lang)) mai hoi. hieu ve cam ((xuc ban) or (duc van)) thanh va cua quoc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((y lang) OR (o lang)) mai hoi. hieu ve cam ((xuc ban) OR (duc van)) thanh va cua quoc.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((y lang) OR (o lang)) mai hoi. hieu ve cam ((xuc ban) or (duc van)) thanh va cua quoc".
• Adding a wildcard symbol may retrieve word variants: tu sach ((y lang) OR (o lang)) mai hoi. hieu ve cam ((xuc ban) or (duc van)) thanh va cua quoc*.