Perhaps you should try some spelling variations:
ve triet » va trien, su triet
van hanh » van thanh, ban hanh, van anh
nang may » mang may, nang ma, bang may
cam tuc » cam tu, nam thuc, dam thuc
hanh gi » hanh vi, danh gia, hanh noi
may hoi » may thoi, tay hoi, mai hoi
hieu ve » hieu va, hieu van
su sai » su hai, su dai, su mai
su tai » su thi, tu tai
gi ve » gia ve, gi de, gi he

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sai) OR (su tai)) ky nang may hoi. hieu ve ((cam tuc) or (cam xuc)) van hanh gi ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sai) OR (su tai)) ky nang may hoi. hieu ve ((cam tuc) OR (cam xuc)) van hanh gi ve triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sai) OR (su tai)) ky nang may hoi. hieu ve ((cam tuc) or (cam xuc)) van hanh gi ve triet".
• Adding a wildcard symbol may retrieve word variants: ((su sai) OR (su tai)) ky nang may hoi. hieu ve ((cam tuc) or (cam xuc)) van hanh gi ve triet*.