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
sach thu » sach thue, sach thieu, sach tham
cau duc » cao duc, cau luc, chu duc
hieu va » lieu va, hieu qua
su sach » so sach, vu sach
tang ma » mang may, tang van
nang xa » nang x, lang xa, nang ma
hieu ve » hieu van
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 thu ((nang xa) OR (tang ma)) hoi. ((hieu ve) OR (hieu va)) cau duc va thanh vi ve triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach thu ((nang xa) or (tang ma)) hoi. ((hieu ve) OR (hieu va)) cau duc va thanh vi ve triet~".
• Adding a wildcard symbol may retrieve word variants: su sach thu ((nang xa) or (tang ma)) hoi. ((hieu ve) OR (hieu va)) cau duc va thanh vi ve triet*.