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
thu sach » thuat sach, thuoc sach, thu hoach
nang dai » nang dau, nang tai, lang dai
vuc van » duc van, luc van, thuc van
tu sach » su sach, te sach, tu cach
dai hoi » dai hoc, dai hai, dai moi
va dao » ca dao
y nang » ky nang, ly nang, v nang
vi cua » vai cua, di cua
va cao » va cac, va co, va bao

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 sach)) y nang dai hoi. hieu ((va cao) OR (va dao)) vuc van thanh vi cua thuoc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) y nang dai hoi. hieu ((va cao) OR (va dao)) vuc van thanh vi cua thuoc.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thu sach)) y nang dai hoi. hieu ((va cao) OR (va dao)) vuc van thanh vi cua thuoc".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) y nang dai hoi. hieu ((va cao) OR (va dao)) vuc van thanh vi cua thuoc*.