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

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