Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
thanh tai » thanh hai, thanh toan, doanh tai
ban thanh » ban hanh, ban hang
va triet » va thiet, va trien, ve triet
lam duoc » nam duoc, luat duoc, lam thuoc
duoc ban » duc ban, quoc ban, buoc ban
hieu van » hieu va, thien van, lieu va
van lam » van nam
sach ty » sach y, sach tu, sach thu
cua tre » cua te, cuu tre, dua tren
ty nang » ky nang, ty xang, ty hang
tu sach » thu sach, su sach, te sach
nang o » nang co, nang ho, nang ro
o hoi » co hoi, o hoc, o hai

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 ty nang o hoi. hieu van lam duoc ban thanh tai ((cua tre) or (((cua triet) or (va triet))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang o hoi. hieu van lam duoc ban thanh tai ((cua tre) OR (((cua triet) OR (va triet)))).
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang o hoi. hieu van lam duoc ban thanh tai ((cua tre) or (((cua triet) or (va triet))))*.