Perhaps you should try some spelling variations:
danh dien » dinh dien, danh kien, danh lien
cam thuc » am thuc, nam thuc, cam thu
su triet » su viet, su tien, ve triet
sang ky » sang kyo, dang ky, tang ky
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
thuc va » thuc vat, thuc dan, thuc day
va danh » va dinh, va dan, va hanh
dien su » dien tu, nien su, den su
dan ky » van ky
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 xa hoi. hieu va cam thuc va danh dien su triet~.
• 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 va danh dien su triet.
• Adding a wildcard symbol may retrieve word variants: tu ((dan ky) or (sang ky)) lang xa hoi. hieu va cam thuc va danh dien su triet*.