Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
mai khoi » mai khoa, tai khoa, cac khoi
sai cua » dai cua, hai cua, lai cua
va danh » va dinh, va hanh, dia danh
sach ky » sac ky, sach y, sach ty
te sach » toc sach
hieu he » hieu ve, hiem he, hieu le
va dan » ca dan, va dao, va dau
ma hoi » mai hoi, xa hoi, ma hoa
he nam » ha nam, nghe nam

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 nang ((ma hoi) or (mai khoi)). hieu he nam thu ((va danh) OR (va dan)) sai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang ((ma hoi) OR (mai khoi)). hieu he nam thu ((va danh) OR (va dan)) sai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang ((ma hoi) or (mai khoi)). hieu he nam thu ((va danh) OR (va dan)) sai cua triet".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang ((ma hoi) or (mai khoi)). hieu he nam thu ((va danh) OR (va dan)) sai cua triet*.