Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
van luan » van quan, van tuan, von luan
luan san » luan van, luan hoan, luan phan
su sach » so sach, vu sach
van cau » van dau, van hau, van chat
cau xuc » cam xuc, cau luc, cau truc
xuc van » duc van, luc van, vuc van
cua tre » cua te, cuu tre, dua tren
y nang » ky nang, ly nang, v nang
x hoi » xa hoi, o hoi, 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: su sach y nang ((x hoi) OR (x ho)). hieu van cau xuc van luan san ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang ((x hoi) OR (x ho)). hieu van cau xuc van luan san ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang ((x hoi) OR (x ho)). hieu van cau xuc van luan san ((cua tre) or (cua triet))".
• Adding a wildcard symbol may retrieve word variants: su sach y nang ((x hoi) OR (x ho)). hieu van cau xuc van luan san ((cua tre) or (cua triet))*.