Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
hieu van » hieu va, thien van, lieu va
van pham » san pham, van phan, van phat
so sach » so sanh, co sach, hoc sach
bo sach » co sach, hoc sach
duc van » duc va, duc tan, duc manh
tai cua » thai cua, tai cuc, dai cua
y nang » ky nang, ly nang, v nang
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((so sach) or (bo sach)) y nang x hoi. hieu van pham duc van thanh ((tai cua) OR (tri cua)) tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (bo sach)) y nang x hoi. hieu van pham duc van thanh ((tai cua) OR (tri cua)) tu*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) or (bo sach)) y nang x hoi. hieu van pham duc van thanh ((tai cua) OR (tri cua)) tu*".