Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
cay phoi » cap phoi, tay hoi, cay cho
hieu van » hieu va, thien van, lieu va
cam luc » cam xuc, cau luc
cua tre » cua te, cuu tre, dua tren
hanh va » hang va, hanh vi
va hanh » van hanh, va thanh, va danh
te sach » toc sach
ty dong » tay dong, tu dong, ly dong
van cam » van nam, van lam, van cau
luc va » duc va, tuc va, loc va

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 ((ty dong) or (ty xang)) cay phoi. hieu van cam luc va hanh va ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ty dong) OR (ty xang)) cay phoi. hieu van cam luc va hanh va ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((ty dong) or (ty xang)) cay phoi. hieu van cam luc va hanh va ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: te sach ((ty dong) or (ty xang)) cay phoi. hieu van cam luc va hanh va ((cua tre) OR (cua triet))*.