Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
te sach » toc sach
va hanh » van hanh, va thanh, va danh
cam loc » cam lo
cuu tre » cua tre, cau tren, cau treo
hieu va » lieu va, hieu qua
y nang » ky nang, ly nang, v nang
loc va » hoc va, luc va
va cam » va cham, va cac, va cao
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: te sach y nang ((x hoi) OR (o hoi)). hieu va cam loc va hanh vi ((cua triet) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang ((x hoi) OR (o hoi)). hieu va cam loc va hanh vi ((cua triet) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y nang ((x hoi) OR (o hoi)). hieu va cam loc va hanh vi ((cua triet) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: te sach y nang ((x hoi) OR (o hoi)). hieu va cam loc va hanh vi ((cua triet) or (cuu tre))*.