Perhaps you should try some spelling variations:
ve triet » va trien, su triet
hanh doi » thanh doi, hanh noi, hang doi
hieu van » hieu va, thien van, lieu va
tang xa » trang xa, tang ma, lang xa
ky tang » ky nang, ky dang, kho tang
su sach » so sach, vu sach
luc va » duc va, tuc va
loc va » hoc va
doi ve » moi ve, doi va, noi ve
su sac » su cac, su xac

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: ((su sac) OR (su sach)) ky tang xa hoi. hieu van ban ((luc va) OR (loc va)) hanh doi ve triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sac) or (su sach)) ky tang xa hoi. hieu van ban ((luc va) OR (loc va)) hanh doi ve triet~".
• Adding a wildcard symbol may retrieve word variants: ((su sac) or (su sach)) ky tang xa hoi. hieu van ban ((luc va) OR (loc va)) hanh doi ve triet*.