Perhaps you should try some spelling variations:
cua thuoc » nha thuoc, cay thuoc, cua nuoc
quan den » quan doan, quan he, quan doi
den cua » dien cua, de cua, ben cua
luc van » luoc van, luu van, duc van
vuc van » duc van, thuc van, chuc van
te sach » toc sach
mai hoi » mai khoi, dai hoi, mai doi
lai hoi » dai hoi, lai hoa, lai roi
hieu ve » hieu va, hieu van
ve cac » va cac, vien cac
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach v nang ((mai hoi) or (lai hoi)). hieu ve cac ((vuc van) or (luc van)) quan den cua thuoc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach v nang ((mai hoi) OR (lai hoi)). hieu ve cac ((vuc van) OR (luc van)) quan den cua thuoc.
• Adding a wildcard symbol may retrieve word variants: te sach v nang ((mai hoi) or (lai hoi)). hieu ve cac ((vuc van) or (luc van)) quan den cua thuoc*.