Perhaps you should try some spelling variations:
ve triet » va trien, su triet
thanh vi » hanh vi, thanh va, thanh ve
va thanh » gia thanh, ban thanh, va tinh
thi hang » thi hanh, thi nang, thi hong
qua cac » cua cac
su sach » so sach, vu sach
qua cau » quan cau, qua ca, qua cai
ty hang » ly hang, ty xang, thu hang
luc va » duc va, tuc va, loc va
vi ve » va ve, gi ve, ve ve

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

• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ty hang) OR (thi hang)) xa hoi. hieu ((qua cau) OR (qua cac)) luc va thanh vi ve triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ty hang) or (thi hang)) xa hoi. hieu ((qua cau) OR (qua cac)) luc va thanh vi ve triet~".
• Adding a wildcard symbol may retrieve word variants: su sach ((ty hang) or (thi hang)) xa hoi. hieu ((qua cau) OR (qua cac)) luc va thanh vi ve triet*.