Perhaps you should try some spelling variations:
cay thuoc » cua thuoc, nam thuoc, va thuoc
ban hanh » ban hang
hanh va » hang va, hanh vi
cao duc » dao duc, cao suc, giao duc
sach ty » sach y, sach tu, sach thu
te sach » toc sach
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
va cay » va cac, va cao, va cai

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 ty ((lang xa) or (mang may)) hoi. hieu ve ((pham duc) or (cao duc)) ban hanh va cay thuoc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty ((lang xa) OR (mang may)) hoi. hieu ve ((pham duc) OR (cao duc)) ban hanh va cay thuoc.
• Adding a wildcard symbol may retrieve word variants: te sach ty ((lang xa) or (mang may)) hoi. hieu ve ((pham duc) or (cao duc)) ban hanh va cay thuoc*.