Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
va trien » va truyen, va thiet, va tuyen
hanh vai » hanh vi, hanh va, hanh tai
ban hanh » ban hang
tham luu » tam luu, thanh luu, cham cuu
dang xay » dang van, van xay
hieu va » lieu va, hieu qua
va tham » van tham, va cham, va thanh
lang xa » lang ha, lang van
luu ban » luu bang, luu van, luu dan

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu cac ky ((lang xa) OR (dang xay)) hoi. hieu va tham luu ban hanh vai ((va trien) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cac ky ((lang xa) OR (dang xay)) hoi. hieu va tham luu ban hanh vai ((va trien) OR (su triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cac ky ((lang xa) OR (dang xay)) hoi. hieu va tham luu ban hanh vai ((va trien) or (su triet))".
• Adding a wildcard symbol may retrieve word variants: tu cac ky ((lang xa) OR (dang xay)) hoi. hieu va tham luu ban hanh vai ((va trien) or (su triet))*.