Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
chi cua » chi cuc, khi cua, cuoi cua
va danh » va dinh, va hanh, dia danh
sach ky » sac ky, sach y, sach ty
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
cac tuc » cac toc, cac tu, cac tac
va dan » ca dan, va dao, va dau
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 ky nang ((me hoi) or (ma hoa)). hieu va cac tuc ((va danh) OR (va dan)) chi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ((me hoi) OR (ma hoa)). hieu va cac tuc ((va danh) OR (va dan)) chi cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang ((me hoi) or (ma hoa)). hieu va cac tuc ((va danh) OR (va dan)) chi cua triet".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang ((me hoi) or (ma hoa)). hieu va cac tuc ((va danh) OR (va dan)) chi cua triet*.