Perhaps you should try some spelling variations:
cay thuoc » cua thuoc, nam thuoc, va thuoc
ban thanh » ban hang
ban hanh » ban hang
sach thu » sach thue, sach thieu, sach tham
lang van » dang van, tang van, hoang van
hieu ve » hieu va, hieu van
sach ty » sach y, sach tu, xach tay
van hoi » van hoa, van hoc, van hoe
ve cay » ve cac, va cay, ve cai
le cua » ly 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 ty) or (sach thu)) lang van hoi. hieu ve cay thuoc ((ban thanh) OR (ban hanh)) le cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach thu)) lang van hoi. hieu ve cay thuoc ((ban thanh) OR (ban hanh)) le cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ty) or (sach thu)) lang van hoi. hieu ve cay thuoc ((ban thanh) OR (ban hanh)) le cua vat".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) or (sach thu)) lang van hoi. hieu ve cay thuoc ((ban thanh) OR (ban hanh)) le cua vat*.