Perhaps you should try some spelling variations:
ve triet » va trien, su triet
hanh va » hang va, hanh vi
hanh ve » hanh vi, hanh kem
hieu ve » hieu va, hieu van
tu sach » thu sach, su sach, te sach
sach v » sach va, sach y, sach 2
du ban » dua ban, duc ban, du bao
v nang » va nang, vu nang, van nang
ve cac » va cac, vien cac
o hoc » co hoc, mo hoc, so hoc

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 nang ((xa hoi) or (o hoc)). hieu ve cac du ban ((hanh ve) OR (hanh va)) ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach v nang ((xa hoi) OR (o hoc)). hieu ve cac du ban ((hanh ve) OR (hanh va)) ve triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach v nang ((xa hoi) or (o hoc)). hieu ve cac du ban ((hanh ve) OR (hanh va)) ve triet*".