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

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