Perhaps you should try some spelling variations:
cua thuoc » nha thuoc, cay thuoc, cua nuoc
hieu van » hieu va, thien van, lieu va
van vanh » van anh, van hanh, van manh
vanh dai » van dai, vanh tai, lanh dao
su sach » so sach, vu sach
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
van lam » van nam
lam vo » lam co, lam so, lam vu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (vay khach)) ky lang xa hoi. hieu van lam vo van vanh dai cua thuoc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vay khach)) ky lang xa hoi. hieu van lam vo van vanh dai cua thuoc.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vay khach)) ky lang xa hoi. hieu van lam vo van vanh dai cua thuoc*.