Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
cac thuc » cach thuc, cac thu, can thuc
hieu cua » hieu qua, dieu cua, bieu cua
so sach » bo sach, co sach, hoc sach
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
lang ha » long ha
lang xa » dang xay, lang van
so sanh » do sanh
cua tuc » cua duc, cua tu, cua thuoc

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (so sanh)) v ((lang xa) OR (lang ha)) hoi. hieu cua cac thuc va hanh vai cua tuc~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) or (so sanh)) v ((lang xa) OR (lang ha)) hoi. hieu cua cac thuc va hanh vai cua tuc~".
• Adding a wildcard symbol may retrieve word variants: ((so sach) or (so sanh)) v ((lang xa) OR (lang ha)) hoi. hieu cua cac thuc va hanh vai cua tuc*.