Perhaps you should try some spelling variations:
toc sach » doc sach, thuoc sach, nuoc sach
su triet » su viet, su tien, ve triet
hoc sach » hoc sinh, hoc cac, hoc anh
ky dang » ky nang, ky danh
xay hoi » tay hoi, cay phoi, gay thoi
hieu ve » hieu va, hieu van
xuc may » xuc hay, truc may, phuc may
tinh ve » trinh ve, tinh ven, dinh ve
ve cam » ve cham, ve cac, va cam
ve su » va su

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((toc sach) OR (hoc sach)) ky dang ((xay hoi) or (xa hoi)). hieu ve cam xuc may tinh ve su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (hoc sach)) ky dang ((xay hoi) OR (xa hoi)). hieu ve cam xuc may tinh ve su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (hoc sach)) ky dang ((xay hoi) or (xa hoi)). hieu ve cam xuc may tinh ve su triet".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) OR (hoc sach)) ky dang ((xay hoi) or (xa hoi)). hieu ve cam xuc may tinh ve su triet*.