Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu van » thien van, lieu va, hieu ve
vu sach » vu bach, su sach, vu khach
hieu va » lieu va, hieu qua
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang
vi cua » vai cua, di cua
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: vu sach v nang ((o hoi) or (x ho)). ((hieu van) or (hieu va)) am thuc va hanh vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach v nang ((o hoi) OR (x ho)). ((hieu van) OR (hieu va)) am thuc va hanh vi cua triet.
• Adding a wildcard symbol may retrieve word variants: vu sach v nang ((o hoi) or (x ho)). ((hieu van) or (hieu va)) am thuc va hanh vi cua triet*.