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