Perhaps you should try some spelling variations:
ve triet » va trien
dang xay » dang van, van xay
su triet » su viet, su tien
hieu van » hieu va, thien van, lieu va
lang xa » lang ha, lang van
van cau » van dau, van hau, van chat
va hanh » van hanh, va thanh, va danh
hanh va » hang va, hanh vi
sac ky » cac ky, sai ky
cau tu » dau tu, cau truc
tu sac » tu sach, tu cac, tu san

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky ((lang xa) OR (dang xay)) hoi. hieu van cau tu va hanh va ((su triet) or (ve triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky ((lang xa) OR (dang xay)) hoi. hieu van cau tu va hanh va ((su triet) OR (ve triet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky ((lang xa) OR (dang xay)) hoi. hieu van cau tu va hanh va ((su triet) or (ve triet))*".