Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu cac » hieu luc, hieu va, hieu van
hien cac » thien cac, vien cac, dien cac
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
cach tu » cach thuc
va lanh » va lang, va danh, va hanh
lanh vi » lanh voi, hanh vi, lanh va
tu cach » tu cac
lop va » lap va, hop va, nop va
vi cua » vai cua, di cua

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

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