Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
lam truoc » lam thuoc, nam truoc, lam truong
cam truc » cau truc, nam truc, nam truoc
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
va danh » va dinh, va dan, va hanh
danh vi » hanh vi, dinh vi, danh di
su sach » so sach, vu sach
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: su sach y ((nang x) or (nang ma)) hoi. hieu ve ((cam truc) OR (lam truoc)) va danh vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y ((nang x) OR (nang ma)) hoi. hieu ve ((cam truc) OR (lam truoc)) va danh vi cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y ((nang x) or (nang ma)) hoi. hieu ve ((cam truc) OR (lam truoc)) va danh vi cua triet".
• Adding a wildcard symbol may retrieve word variants: su sach y ((nang x) or (nang ma)) hoi. hieu ve ((cam truc) OR (lam truoc)) va danh vi cua triet*.