Perhaps you should try some spelling variations:
cua thuoc » nha thuoc, cay thuoc, cua nuoc
van thanh » ban thanh, van tuan
thanh vi » hanh vi, thanh va, thanh ve
toc sach » hoc sach, doc sach, thuoc sach
thu sach » tu sach, thuat sach, thuoc sach
mai khoi » mai khoa, tai khoa, cac khoi
hieu ve » hieu va, hieu van
dai moi » doi moi, dai hoi
cac luc » cau luc, coc luc, cac nuoc
luc van » luoc van, luu van, duc van
o lang » hoa lang, hoi lang
ve cac » va cac, vien cac
vi cua » vai cua, di cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((toc sach) or (thu sach)) o lang ((dai moi) or (mai khoi)). hieu ve cac luc van thanh vi cua thuoc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (thu sach)) o lang ((dai moi) OR (mai khoi)). hieu ve cac luc van thanh vi cua thuoc.
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (thu sach)) o lang ((dai moi) or (mai khoi)). hieu ve cac luc van thanh vi cua thuoc*.