Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
day hanh » day nhanh, day thanh, dao hanh
thuc day » thuc dan, thuc vat
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
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.

• Performing a fuzzy search may retrieve terms with similar spellings: ((so sach) or (so sanh)) v ((lang xa) OR (lang ha)) hoi. hieu cua cac thuc day hanh vai cua tuc~.
• 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 day 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 day 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 day hanh vai cua tuc*.