Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
hanh ve » hanh vi, hanh va, hanh kem
qua ban » cua ban, qua quan
duc ban » duc tan, duc van, dua ban
hieu ve » hieu va, hieu van
ve cac » va cac, vien cac
sach v » sach va, sach 2, sach vay
x hoi » xa hoi, o hoi, x ho
ve su » va 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: su ((sach v) OR (sach y)) nang x hoi. hieu ve cac ((duc ban) OR (qua ban)) hanh ve su triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach v) OR (sach y)) nang x hoi. hieu ve cac ((duc ban) or (qua ban)) hanh ve su triet~".
• Adding a wildcard symbol may retrieve word variants: su ((sach v) OR (sach y)) nang x hoi. hieu ve cac ((duc ban) or (qua ban)) hanh ve su triet*.