Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thi cua » thai cua, thi cuc, tri cua
hieu va » lieu va, hieu qua
su sach » so sach, vu sach
cac tuc » cac toc, cac tu, cac tac
y nang » ky nang, ly nang, v nang
va dan » va dao, va dau, va dap
ca dan » cac dan, ca dao
me hoi » le hoi

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sach y nang ((me hoi) or (ma hoa)). hieu va cac tuc ((va dan) OR (ca dan)) thi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang ((me hoi) OR (ma hoa)). hieu va cac tuc ((va dan) OR (ca dan)) thi cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang ((me hoi) or (ma hoa)). hieu va cac tuc ((va dan) OR (ca dan)) thi cua triet".
• Adding a wildcard symbol may retrieve word variants: su sach y nang ((me hoi) or (ma hoa)). hieu va cac tuc ((va dan) OR (ca dan)) thi cua triet*.