Perhaps you should try some spelling variations:
thien van » thi van
thanh lam » thanh lap, hanh lam, thanh nam
hieu van » hieu va, lieu va, hieu ve
va triet » va thiet, va trien, ve triet
vu sach » vu bach, su sach, vu khach
y nang » ky nang, ly nang, v nang
nang o » nang co, nang ho, nang ro
xuc va » tuc va, luc va, xac va
lam va » nam va, dam va, lam ha
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 y nang o hoi. ((hieu van) OR (thien van)) cau ((xuc va) or (duc va)) thanh lam va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach y nang o hoi. ((hieu van) OR (thien van)) cau ((xuc va) OR (duc va)) thanh lam va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach y nang o hoi. ((hieu van) OR (thien van)) cau ((xuc va) or (duc va)) thanh lam va triet".
• Adding a wildcard symbol may retrieve word variants: vu sach y nang o hoi. ((hieu van) OR (thien van)) cau ((xuc va) or (duc va)) thanh lam va triet*.