Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
ban hanh » ban hang
van hanh » van thanh, van anh, van ban
hieu van » hieu va, thien van, lieu va
kho tang » cao tang
tang xa » trang xa, tang ma, lang xa
nam xuc » cam xuc, nam xua, nam thuc
so sach » so sanh, bo sach, co sach
dan cua » dan ca, ban cua, dai cua
su sach » vu sach

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)) kho tang xa hoi. hieu van nam xuc ((van hanh) OR (ban hanh)) dan cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) kho tang xa hoi. hieu van nam xuc ((van hanh) OR (ban hanh)) dan cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (so sach)) kho tang xa hoi. hieu van nam xuc ((van hanh) OR (ban hanh)) dan cua triet".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sach)) kho tang xa hoi. hieu van nam xuc ((van hanh) OR (ban hanh)) dan cua triet*.