Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
va cham » va chat, va tham
hanh de » hanh ve, hanh kem
tu sach » thu sach, su sach, te sach
y nang » ky nang, ly nang, v nang
goc va » hoc va, doc va, uoc va
loc va » hoc va, luc va
de cua » le cua, te cua, dieu cua
o hoi » co hoi, o hoc, o hai
x hoi » xa hoi, x ho, 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 (o hoi)). lieu va cham ((goc va) or (loc va)) hanh de cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang ((x hoi) OR (o hoi)). lieu va cham ((goc va) OR (loc va)) hanh de cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang ((x hoi) OR (o hoi)). lieu va cham ((goc va) or (loc va)) hanh de cua triet".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ((x hoi) OR (o hoi)). lieu va cham ((goc va) or (loc va)) hanh de cua triet*.