Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
cham luc » nhan luc, cham cuu, chat lua
dau cua » dai cua, day cua, cau cua
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, va dan, dia danh
te sach » toc sach
hieu va » lieu va, hieu qua
tang ma » mang may, tang van
sach 6 » sach y, sach 2
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 6 tang ma hoi. hieu va ((cham luc) or (cham soc)) ((va danh) OR (va hanh)) dau cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach 6 tang ma hoi. hieu va ((cham luc) OR (cham soc)) ((va danh) OR (va hanh)) dau cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach 6 tang ma hoi. hieu va ((cham luc) or (cham soc)) ((va danh) OR (va hanh)) dau cua triet".
• Adding a wildcard symbol may retrieve word variants: te sach 6 tang ma hoi. hieu va ((cham luc) or (cham soc)) ((va danh) OR (va hanh)) dau cua triet*.