Perhaps you should try some spelling variations:
su triet » su tien, ve triet
tu sach » thu sach, su sach, te sach
qua ban » cua ban, qua quan
duc ban » duc tan, duc van, dua ban
hieu ve » hieu va, hieu van
su viet » so viet
sach 2 » sach y
ve cac » va cac, vien cac
2 nang » v nang
x hoi » xa hoi, o hoi, x ho

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 2 nang x hoi. hieu ve cac ((duc ban) or (qua ban)) hang va ((su triet) OR (su viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach 2 nang x hoi. hieu ve cac ((duc ban) OR (qua ban)) hang va ((su triet) OR (su viet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach 2 nang x hoi. hieu ve cac ((duc ban) or (qua ban)) hang va ((su triet) OR (su viet))*".