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