Perhaps you should try some spelling variations:
nam trung » nam trong, ba trung, nam vung
su triet » su viet, ve triet
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
va hanh » van hanh, va thanh, va danh
hanh va » hang va, hanh vi
su tien » su kien, su hien, tu tieng
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang

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