Perhaps you should try some spelling variations:
ve triet » va trien
van hanh » van thanh, ban hanh, van anh
su triet » su viet, su tien
mang xa » lang xa, mang may, dang xay
nang ma » tang ma, sang ma, nang cao
hanh di » hanh vi, hanh de, hang di
xuc van » duc van, luc van, vuc van
tu van » tu va
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 van ky ((mang xa) or (nang ma)) hoi. lieu va cam xuc van hanh di ((su triet) OR (ve triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu van ky ((mang xa) OR (nang ma)) hoi. lieu va cam xuc van hanh di ((su triet) OR (ve triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu van ky ((mang xa) or (nang ma)) hoi. lieu va cam xuc van hanh di ((su triet) OR (ve triet))".
• Adding a wildcard symbol may retrieve word variants: tu van ky ((mang xa) or (nang ma)) hoi. lieu va cam xuc van hanh di ((su triet) OR (ve triet))*.