Perhaps you should try some spelling variations:
ve triet » va trien
cham cuu » cap cuu, chat cua
su triet » su viet, su tien
ban hanh » ban hang
thi hang » thi hanh, thi nang, thi hong
cuu ban » cuu van, cua ban, cuu san
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
ty hang » ly hang, ty xang, thu hang
ve cham » va cham, ve chat, vu cham

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ((ty hang) OR (thi hang)) xa hoi. hieu ve cham cuu ban hanh vi ((su triet) or (ve triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ty hang) OR (thi hang)) xa hoi. hieu ve cham cuu ban hanh vi ((su triet) OR (ve triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ty hang) OR (thi hang)) xa hoi. hieu ve cham cuu ban hanh vi ((su triet) or (ve triet))".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ty hang) OR (thi hang)) xa hoi. hieu ve cham cuu ban hanh vi ((su triet) or (ve triet))*.