Perhaps you should try some spelling variations:
cua thuoc » nha thuoc, cay thuoc, cua nuoc
van thanh » ban thanh, van tuan
cua quoc » cua nuoc
thanh vi » hanh vi, thanh va, thanh ve
cam luc » cam xuc, cau luc
luc van » luoc van, luu van, duc van
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
o lang » hoa lang, hoi 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) OR (o lang)) mai hoi. hieu ve cam luc van thanh vi ((cua quoc) or (cua thuoc))~.
• 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 luc van thanh vi ((cua quoc) OR (cua thuoc)).
• 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 luc van thanh vi ((cua quoc) or (cua thuoc))".
• Adding a wildcard symbol may retrieve word variants: tu sach ((y lang) OR (o lang)) mai hoi. hieu ve cam luc van thanh vi ((cua quoc) or (cua thuoc))*.