Perhaps you should try some spelling variations:
sach tu » sach thu, cach tu, sach ty
hieu ve » hieu va, hieu van
va hanh » van hanh, va thanh, va danh
hanh di » hanh vi, hanh de, hang di
su tien » su hien, tu tieng, dau tien
ve cam » ve cham, ve cac, va cam
xuc va » duc va, tuc va, luc va
x hoi » xa hoi, o hoi, x ho
kien » bien, vien, dien

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach y) or (sach tu)) nang x hoi. hieu ve cam xuc va hanh di ((su tien) OR (su kien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach y) OR (sach tu)) nang x hoi. hieu ve cam xuc va hanh di ((su tien) OR (su kien)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach y) or (sach tu)) nang x hoi. hieu ve cam xuc va hanh di ((su tien) OR (su kien))".
• Adding a wildcard symbol may retrieve word variants: tu ((sach y) or (sach tu)) nang x hoi. hieu ve cam xuc va hanh di ((su tien) OR (su kien))*.