Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh cua » manh cua, hang cua, hanh sua
cua cua » cua chua, ca cua, qua cua
va hanh » van hanh, va thanh, va danh
cac luc » cau luc, cac nuoc, cac cuoc
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma

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

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