Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh dao » lanh dao, thanh dat, thanh dam
cham luc » nhan luc, cham cuu, chat lua
dao cua » dai cua, day cua, dan cua
va hanh » van hanh, va thanh, va danh
te sach » toc sach
hieu va » lieu va, hieu qua
y tang » ky tang, 7 tang, 5 tang
ma hoi » mai hoi, xa hoi, ma hoa

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ((y tang) or (6 tang)) ma hoi. hieu va ((cham luc) OR (cham soc)) va hanh dao cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((y tang) OR (6 tang)) ma hoi. hieu va ((cham luc) OR (cham soc)) va hanh dao cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((y tang) or (6 tang)) ma hoi. hieu va ((cham luc) OR (cham soc)) va hanh dao cua triet".
• Adding a wildcard symbol may retrieve word variants: te sach ((y tang) or (6 tang)) ma hoi. hieu va ((cham luc) OR (cham soc)) va hanh dao cua triet*.