Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
danh dau » lanh dao, hang dau, danh tu
cham luc » nhan luc, cham cuu, chat lua
toc sach » doc sach, thuoc sach, nuoc sach
hoc sach » hoc sinh, hoc cac, hoc anh
tang ma » mang may, tang van
hieu ve » hieu va, hieu van
va danh » va dinh, va dan, va hanh
dau cua » dai cua, day cua, cau cua
ma hoi » mai hoi, xa hoi, ma hoa
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: ((toc sach) OR (hoc sach)) y tang ma hoi. hieu ve ((cham luc) or (cham soc)) va danh dau cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (hoc sach)) y tang ma hoi. hieu ve ((cham luc) OR (cham soc)) va danh dau cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (hoc sach)) y tang ma hoi. hieu ve ((cham luc) or (cham soc)) va danh dau cua triet".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) OR (hoc sach)) y tang ma hoi. hieu ve ((cham luc) or (cham soc)) va danh dau cua triet*.