Perhaps you should try some spelling variations:
tran thanh » ban thanh, van thanh, quan thanh
tan thanh » tang thanh, toan thanh, ban thanh
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
van bao » van ban, van dao
bao duc » dao duc, bao luc, cao duc
hai cua » thai cua, dai cua, hoi cua
y nang » ky nang, ly nang, v nang
x hoi » o hoi, x ho, 5 hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach y nang ((x hoi) or (xa hoi)). hieu van bao duc ((tan thanh) OR (tran thanh)) hai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang ((x hoi) OR (xa hoi)). hieu van bao duc ((tan thanh) OR (tran thanh)) hai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang ((x hoi) or (xa hoi)). hieu van bao duc ((tan thanh) OR (tran thanh)) hai cua triet".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ((x hoi) or (xa hoi)). hieu van bao duc ((tan thanh) OR (tran thanh)) hai cua triet*.