Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
cam thuc » nam thuc, cam thu, can thuc
hanh de » hanh ve, hanh kem
va hanh » van hanh, va thanh, va danh
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
sang ky » sang kyo, dang ky, tang ky
dan ky » van ky
de cua » le cua, te cua, dieu 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 (sang ky)) lang xa hoi. hieu va ((cam thuc) OR (am thuc)) va hanh de cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((dan ky) OR (sang ky)) lang xa hoi. hieu va ((cam thuc) OR (am thuc)) va hanh de cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((dan ky) or (sang ky)) lang xa hoi. hieu va ((cam thuc) OR (am thuc)) va hanh de cua viet".
• Adding a wildcard symbol may retrieve word variants: tu ((dan ky) or (sang ky)) lang xa hoi. hieu va ((cam thuc) OR (am thuc)) va hanh de cua viet*.