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