Perhaps you should try some spelling variations:
ve triet » va trien, su triet
van hanh » van thanh, ban hanh, van anh
truc van » truc va, thuc van, truc ban
vien dai » hien dai
vien cac » vien bach, vien da, gian cac
so sach » so sanh, bo sach, co sach
hanh di » hanh vi, hanh de, hang di
su sach » vu sach
v nang » va nang, vu nang, van nang
x hoi » xa hoi, o hoi, x ho
di ve » dai ve, de ve, do ve

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) OR (so sach)) v nang x hoi. hieu ((vien cac) or (vien dai)) truc van hanh di ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) v nang x hoi. hieu ((vien cac) OR (vien dai)) truc van hanh di ve triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (so sach)) v nang x hoi. hieu ((vien cac) or (vien dai)) truc van hanh di ve triet".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (so sach)) v nang x hoi. hieu ((vien cac) or (vien dai)) truc van hanh di ve triet*.