Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
cau treo » cau theo, cau tren, cau triet
hieu van » hieu va, thien van, lieu va
thu sach » thuat sach, thuoc sach, thu hoach
van cam » van nam, van lam, van cau
va hanh » van hanh, va thanh, va danh
hanh di » hanh vi, hanh de, hang di
tu sach » su sach, te sach, tu cach
y nang » ky nang, ly nang, v nang
nang o » nang co, nang ho, nang ro
xuc va » duc va, tuc va, luc 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: ((tu sach) or (thu sach)) y nang o hoi. hieu van cam xuc va hanh di ((cau treo) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) y nang o hoi. hieu van cam xuc va hanh di ((cau treo) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) y nang o hoi. hieu van cam xuc va hanh di ((cau treo) or (cua triet))*.