Perhaps you should try some spelling variations:
luan nhan » luan phan, luan nha, xuan nhan
hieu luan » hieu luat, hieu quan, tieu luan
thanh van » thanh san, thanh toan, thanh phan
thanh vi » hanh vi, thanh va, thanh ve
nhan luc » nang luc
va triet » va thiet, va trien, ve triet
sach ty » sach y, sach tu, sach thu
ty hang » ly hang, ty xang, thi hang
su sach » so sach, vu sach
luc va » duc va, tuc va, loc va
ma hoi » mai hoi, ma hoa, me hoi

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 ty hang ((ma hoi) or (xa hoi)). hieu luan nhan luc va ((thanh vi) or (thanh van)) va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty hang ((ma hoi) OR (xa hoi)). hieu luan nhan luc va ((thanh vi) OR (thanh van)) va triet.
• Adding a wildcard symbol may retrieve word variants: su sach ty hang ((ma hoi) or (xa hoi)). hieu luan nhan luc va ((thanh vi) or (thanh van)) va triet*.