Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
su triet » su tien, ve triet
dang xay » dang van, van xay
hanh ve » hanh vi, hanh va, hanh kem
va hanh » van hanh, va thanh, va danh
hieu ve » hieu va, hieu van
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky nang, ky danh
su viet » so viet
ve cam » ve cham, ve cac, va cam
xuc va » duc va, tuc va, luc va

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) or (toc sach)) ky dang xay hoi. hieu ve cam xuc va hanh ve ((su triet) or (su viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ky dang xay hoi. hieu ve cam xuc va hanh ve ((su triet) OR (su viet)).
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) ky dang xay hoi. hieu ve cam xuc va hanh ve ((su triet) or (su viet))*.