Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh sua » hinh su, hanh va, hanh tu
sua cua » sua chua, qua cua, lua cua
va hanh » van hanh, va thanh, va danh
cam luc » cau luc
hieu ve » hieu va, hieu van
su sach » so sach, vu sach
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, nang cao

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