Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
cua thuoc » nha thuoc, cay thuoc, cua nuoc
lang dai » lang hai, lang mai, lang chai
dai khoi » dai hoi, dai khoa, mai khoi
quoc ban » quoc bao, quoc lan, quoc quan
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
xuc ban » duc ban, cuc ban, xuat 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 dai khoi. hieu ve cam ((((xuc ban) or (quoc ban))) or (duc van)) thanh dai cua thuoc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y lang dai khoi. hieu ve cam ((((xuc ban) OR (quoc ban))) OR (duc van)) thanh dai cua thuoc.
• Adding a wildcard symbol may retrieve word variants: tu sach y lang dai khoi. hieu ve cam ((((xuc ban) or (quoc ban))) or (duc van)) thanh dai cua thuoc*.