Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
dua ban » dia ban, cua ban, qua ban
duc ban » duc tan, duc van, duc man
sach va » sach xa, sach ha, sach dao
hieu ve » hieu va, hieu van
nang o » nang co, nang ho, nang ro
sach v » sach y, sach 2, sach vay
ve cac » va cac, vien cac
o hai » co hai, so hai, o lai
vi su » va su, ve su, ki su

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: tu ((sach v) OR (sach va)) nang o hai. hieu ve cac ((duc ban) OR (dua ban)) hanh vi su triet~.
• Adding a wildcard symbol may retrieve word variants: tu ((sach v) or (sach va)) nang o hai. hieu ve cac ((duc ban) or (dua ban)) hanh vi su triet*.