Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh dai » hanh tai, hanh dao, vanh dai
cham tuc » nham thuc, pham thuc, tham thuc
van cham » van chat, van tham, va cham
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
dai hoi » dai hoc, dai hai, dai moi
ly nang » ky nang, ly hang, ly vang
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, dua tren
y nang » ky nang, v nang, may nang
tuc va » thuc va, truc va, tuc xa

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ((y nang) OR (ly nang)) dai hoi. hieu van cham tuc va hanh dai ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((y nang) OR (ly nang)) dai hoi. hieu van cham tuc va hanh dai ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ((y nang) OR (ly nang)) dai hoi. hieu van cham tuc va hanh dai ((cua tre) or (cua triet))".
• Adding a wildcard symbol may retrieve word variants: toc sach ((y nang) OR (ly nang)) dai hoi. hieu van cham tuc va hanh dai ((cua tre) or (cua triet))*.