Perhaps you should try some spelling variations:
cua triet » cua viet, va triet
toc sach » hoc sach, doc sach, thuoc sach
su triet » su viet, su tien, ve triet
tay hoi » tao hoi, tay thai
sach ky » sac ky, sach y, sach ty
xuc may » xuc hay, truc may, phuc may
tinh ve » trinh ve, tinh ven, dinh ve
ky dang » ky nang, ky danh
hieu ve » hieu va, hieu van
tay ho » tay co, tay o, tay khao
ve cam » ve cham, ve cac, va cam

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