Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
cham luc » cham soc, nhan luc, cham cuu
toc sach » hoc sach, doc sach, thuoc sach
tang xa » trang xa, tang ma, lang xa
hieu va » lieu va, hieu qua
va cham » va chat, va tham
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
dau cua » dai cua, day cua, cau cua
y tang » ky tang, 6 tang, 7 tang

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