Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
kho tang » cao tang
nhan luc » nang luc
cham luc » cham soc, cham cuu, chat lua
dao cua » dai cua, day cua, dan cua
va lanh » va lang, va danh, va hanh
te sach » toc sach
hieu vu » hieu va, hieu ve, hieu su
y tang » ky tang, 6 tang, 7 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 (kho tang)) ma hoi. hieu vu ((cham luc) OR (nhan luc)) va lanh dao cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((y tang) OR (kho tang)) ma hoi. hieu vu ((cham luc) OR (nhan luc)) va lanh dao cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((y tang) or (kho tang)) ma hoi. hieu vu ((cham luc) OR (nhan luc)) va lanh dao cua triet".
• Adding a wildcard symbol may retrieve word variants: te sach ((y tang) or (kho tang)) ma hoi. hieu vu ((cham luc) OR (nhan luc)) va lanh dao cua triet*.