Perhaps you should try some spelling variations:
cua thuoc » nha thuoc, cay thuoc, cua nuoc
hanh vai » hanh vi, hanh va, hanh tai
ban hanh » ban hang
hieu va » lieu va, hieu qua
vai cua » dai cua, hai cua, lai cua
duc ban » duc tan, duc van, dua ban
cam duc » cam xuc, cao duc, pham duc
te sach » toc sach
sach ty » sach y, sach tu, sach thu
hieu ve » hieu van
mang xa » lang xa, mang may, dang xay
xang xa » lang xa, ang xa, dang xay

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 ((xang xa) or (mang xa)) hoi. ((hieu ve) OR (hieu va)) cam duc ban hanh vai cua thuoc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty ((xang xa) OR (mang xa)) hoi. ((hieu ve) OR (hieu va)) cam duc ban hanh vai cua thuoc.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty ((xang xa) or (mang xa)) hoi. ((hieu ve) OR (hieu va)) cam duc ban hanh vai cua thuoc".
• Adding a wildcard symbol may retrieve word variants: te sach ty ((xang xa) or (mang xa)) hoi. ((hieu ve) OR (hieu va)) cam duc ban hanh vai cua thuoc*.