Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
ban thanh » ban hanh, ban hang
thanh vi » hanh vi, thanh va, thanh ve
cham luc » nhan luc, cham cuu, chat lua
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
y tang » ky tang, 7 tang, 5 tang
ma hoi » mai hoi, xa hoi, ma hoa
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 tang) OR (6 tang)) ma hoi. hieu ve ((cham luc) or (cham soc)) ban thanh vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((y tang) OR (6 tang)) ma hoi. hieu ve ((cham luc) OR (cham soc)) ban thanh vi cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((y tang) OR (6 tang)) ma hoi. hieu ve ((cham luc) or (cham soc)) ban thanh vi cua triet".
• Adding a wildcard symbol may retrieve word variants: su sach ((y tang) OR (6 tang)) ma hoi. hieu ve ((cham luc) or (cham soc)) ban thanh vi cua triet*.