Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
nam trung » nam trong, tai trung, ba trung
hieu van » hieu va, thien van, lieu va
hanh dai » hanh tai, hanh dao, vanh dai
cam truc » cau truc, nam truc, lam truoc
va hanh » van hanh, va thanh, va danh
su sach » so sach, vu sach
nang xa » lang xa, nang ma, mang xa
sach v » sach va, sach y, sach 2

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