Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam tu
van hanh » van thanh, ban hanh, van anh
va triet » va thiet, va trien, ve triet
ky dang » ky nang, ky danh
dang xa » dang xay, lang xa, dang ha
hieu ve » hieu va, hieu van
tu sai » tu bai, tu san, tu cai
sai ky » sac ky
vi va » vi van, vai va, vu va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sai ky dang xa hoi. hieu ve ((nam thuc) or (nam thu)) van hanh vi va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sai ky dang xa hoi. hieu ve ((nam thuc) OR (nam thu)) van hanh vi va triet.
• Adding a wildcard symbol may retrieve word variants: tu sai ky dang xa hoi. hieu ve ((nam thuc) or (nam thu)) van hanh vi va triet*.