Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
danh dai » danh dau, danh di, danh sai
cham tuc » nham thuc, pham thuc, tham thuc
van cham » van chat, van tham, va cham
hieu van » hieu va, thien van, lieu va
mai khoa » tai khoa, may khoa, dai khoa
ly nang » ky nang, ly hang, ly vang
va danh » va dinh, va dan, va hanh
cua tre » cua te, cuu tre, dua tren
te sach » toc sach
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: te sach ((y nang) OR (ly nang)) mai khoa. hieu van cham tuc va danh dai ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((y nang) OR (ly nang)) mai khoa. hieu van cham tuc va danh dai ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((y nang) OR (ly nang)) mai khoa. hieu van cham tuc va danh dai ((cua tre) or (cua triet))".
• Adding a wildcard symbol may retrieve word variants: te sach ((y nang) OR (ly nang)) mai khoa. hieu van cham tuc va danh dai ((cua tre) or (cua triet))*.