Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu hien » bieu hien, dieu hien, chieu chien
hien cac » thien cac, vien cac, hieu cac
nang ma » tang ma, sang ma, nang cao
cac tuc » cac toc, cac tu, cac tac
tuc van » thuc van, truc van, tuc va
nang xa » nang x, lang xa, mang xa
hang di » hang doi, hang dien, hang dich
hang vi » hang va, hanh vi, khang voi
so sach » so sanh, bo sach, co sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach y ((nang xa) OR (nang ma)) hoi. hieu hien cac tuc van ((hang di) or (hang vi)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y ((nang xa) OR (nang ma)) hoi. hieu hien cac tuc van ((hang di) OR (hang vi)) cua triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach y ((nang xa) OR (nang ma)) hoi. hieu hien cac tuc van ((hang di) or (hang vi)) cua triet*".