Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
hieu van » hieu va, thien van, lieu va
ban hanh » ban hang
sach vay » sach va, sach hay, sach nay
van cam » van nam, van lam, van cau
cam duc » cam xuc, cao duc, pham duc
duc ban » duc tan, duc van, dua ban
hanh ve » hanh vi, hanh va, hanh kem
sach 2 » sach y
sach v » sach va, sach y
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.

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((((sach v) OR (sach vay))) or (sach 2)) nang x hoi. hieu van cam duc ban hanh ve su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((((sach v) OR (sach vay))) OR (sach 2)) nang x hoi. hieu van cam duc ban hanh ve su triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((((sach v) OR (sach vay))) or (sach 2)) nang x hoi. hieu van cam duc ban hanh ve su triet*".