Perhaps you should try some spelling variations:
kho tang » cao tang
thai hoc » dai hoc, bai hoc, hoi hoc
su triet » su viet, su tien, ve triet
su sach » so sach, vu sach
ky tang » ky nang, ky dang, ky trong
va thai » van thai, va tai, va tham
va danh » va dinh, va dan, va hanh
danh vi » hanh vi, dinh vi, danh di
ma hoi » mai hoi, xa hoi, ma hoa
vi su » va su, ve su, ki su

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 tang) or (kho tang)) ma hoi. lieu va thai hoc va danh vi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ky tang) OR (kho tang)) ma hoi. lieu va thai hoc va danh vi su triet.
• Adding a wildcard symbol may retrieve word variants: su sach ((ky tang) or (kho tang)) ma hoi. lieu va thai hoc va danh vi su triet*.