Perhaps you should try some spelling variations:
cua thuoc » nha thuoc, cay thuoc, cua nuoc
van thanh » ban thanh, van tuan
thanh di » thanh doi, thanh de, thanh do
luc van » luoc van, luu van, duc van
cam luc » cam xuc, cau luc
hieu ve » hieu va, hieu van
tu sach » thu sach, su sach, te sach
lai hoi » lai hoa, lai roi, mai hoi
dai hoi » dai hoc, dai hai, dai moi
ve cam » ve cham, ve cac, va cam
y nang » ky nang, ly nang, v nang
di cua » dai cua, doi cua, de cua

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) or (thu hoach)) y nang ((lai hoi) or (dai hoi)). hieu ve cam luc van thanh di cua thuoc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu hoach)) y nang ((lai hoi) OR (dai hoi)). hieu ve cam luc van thanh di cua thuoc.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu hoach)) y nang ((lai hoi) or (dai hoi)). hieu ve cam luc van thanh di cua thuoc*.