Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
su triet » su viet, su tien, ve triet
qua tham » qua cham, qua than, qua thanh
cay phoi » cap phoi, tay hoi, cay cho
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
xay hoi » tay hoi, gay thoi, may thoi
ky dang » ky nang, ky danh
vi su » va su, ve su, ki su

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

• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky dang ((((xay hoi) OR (cay phoi))) OR (xa hoi)). hieu qua tham thuc va hanh vi su triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky dang ((((xay hoi) OR (cay phoi))) or (xa hoi)). hieu qua tham thuc va hanh vi su triet~".
• Adding a wildcard symbol may retrieve word variants: su sach ky dang ((((xay hoi) OR (cay phoi))) or (xa hoi)). hieu qua tham thuc va hanh vi su triet*.