Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
lang van » dang van, tang van, hoang van
cam thuc » am thuc, nam thuc, cam thu
hanh di » hanh vi, hanh de, hang di
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay
tang ky » dang ky, trong ky, tang khu
dan ky » van ky
va cam » va cham, va cac, va cao
di cua » dai cua, doi cua, de 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 ((dan ky) or (tang ky)) ((lang xa) OR (lang van)) hoi. hieu va cam thuc va hanh di cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((dan ky) OR (tang ky)) ((lang xa) OR (lang van)) hoi. hieu va cam thuc va hanh di cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((dan ky) or (tang ky)) ((lang xa) OR (lang van)) hoi. hieu va cam thuc va hanh di cua viet".
• Adding a wildcard symbol may retrieve word variants: tu ((dan ky) or (tang ky)) ((lang xa) OR (lang van)) hoi. hieu va cam thuc va hanh di cua viet*.