Perhaps you should try some spelling variations:
vat thanh » dat thanh, gat thanh, tat thanh
cua triet » cua viet, su triet, va triet
thanh de » hanh de, thanh ve, thanh do
tu sach » thu sach, su sach, te sach
hieu va » hieu qua
thu vat » thuc vat, thu va, thuat vat
y nang » ky nang, ly nang, v nang
de cua » le cua, te cua, dieu cua
x hoi » xa hoi, o hoi, 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 (x ho)). ((lieu va) or (hieu va)) nam thu vat thanh de cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang ((x hoi) OR (x ho)). ((lieu va) OR (hieu va)) nam thu vat thanh de cua triet.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ((x hoi) or (x ho)). ((lieu va) or (hieu va)) nam thu vat thanh de cua triet*.