Perhaps you should try some spelling variations:
tan thanh » tran thanh, tang thanh, toan thanh
thanh vai » thanh hai, thanh van, thanh tai
cua triet » cua viet, su triet, va triet
hieu van » thien van, lieu va, hieu ve
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
bao duc » dao duc, bao luc, giao duc
cao duc » dao duc, cao suc, giao duc
vai cua » dai cua, hai cua, lai 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: tu sach y nang x hoi. ((hieu van) OR (hieu va)) ((bao duc) or (cao duc)) tan thanh vai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang x hoi. ((hieu van) OR (hieu va)) ((bao duc) OR (cao duc)) tan thanh vai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang x hoi. ((hieu van) OR (hieu va)) ((bao duc) or (cao duc)) tan thanh vai cua triet".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang x hoi. ((hieu van) OR (hieu va)) ((bao duc) or (cao duc)) tan thanh vai cua triet*.