Perhaps you should try some spelling variations:
cua triet » cua viet, va triet
su triet » su viet, su tien, ve triet
cam thuc » am thuc, nam thuc, cam thu
va hanh » van hanh, va thanh, va danh
sang ky » sang kyo, dang ky, tang ky
lang ha » long ha
hieu va » lieu va, hieu qua
hanh di » hanh vi, hanh de, hang di
thuc va » thuc vat, thuc dan, thuc day
dan ky » van ky
ha hoi » hoa hoi, ha noi, xa hoi
va cam » va cham, va cac, va cao

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 (sang ky)) lang ha hoi. hieu va cam thuc va hanh di ((cua triet) OR (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((dan ky) OR (sang ky)) lang ha hoi. hieu va cam thuc va hanh di ((cua triet) OR (su triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((dan ky) or (sang ky)) lang ha hoi. hieu va cam thuc va hanh di ((cua triet) OR (su triet))".
• Adding a wildcard symbol may retrieve word variants: tu ((dan ky) or (sang ky)) lang ha hoi. hieu va cam thuc va hanh di ((cua triet) OR (su triet))*.