Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
hieu van » hieu va, thien van, lieu va
hanh dao » lanh dao, thanh dat, thanh dam
nhan tai » hang tai, van tai, toan tai
tu sach » thu sach, su sach, te sach
van dau » van dao, phan dau
ky dang » ky nang, ky danh
ky lang » ky nang, ky tang, tay lang
dau xuc » dau xac, dau xua, dau nuoc
xuc va » duc va, tuc va, luc va

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: tu sach ((ky lang) OR (ky dang)) xa hoi. hieu van dau xuc va ((nhan tai) OR (hanh dao)) va triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ky lang) OR (ky dang)) xa hoi. hieu van dau xuc va ((nhan tai) or (hanh dao)) va triet~".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ky lang) OR (ky dang)) xa hoi. hieu van dau xuc va ((nhan tai) or (hanh dao)) va triet*.