Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh hai » thanh hai, nhanh hai, hang hai
cam duc » cam xuc, pham duc, nam duoc
hai cua » thai cua, dai cua, hoi cua
va hanh » van hanh, va thanh, va danh
cao duc » dao duc, cao suc, giao duc
te sach » toc sach
hieu ve » hieu va, hieu van
nang xa » lang xa, nang ma, mang 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 xa) or (nang x)) hoi. hieu ve ((cam duc) OR (cao duc)) va hanh hai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y ((nang xa) OR (nang x)) hoi. hieu ve ((cam duc) OR (cao duc)) va hanh hai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y ((nang xa) or (nang x)) hoi. hieu ve ((cam duc) OR (cao duc)) va hanh hai cua triet".
• Adding a wildcard symbol may retrieve word variants: te sach y ((nang xa) or (nang x)) hoi. hieu ve ((cam duc) OR (cao duc)) va hanh hai cua triet*.