Perhaps you should try some spelling variations:
su triet » su viet, ve triet
tu sach » thu sach, su sach, te sach
va hanh » van hanh, va thanh, va danh
su tien » su kien, su hien, tu tieng
y nang » ky nang, ly nang, v nang
tuc va » thuc va, truc va, tuc xa
ve cam » ve cham, va cam, ve cai
ve cac » va cac, vien cac
x hoi » xa hoi, o hoi, x ho

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 nang x hoi. hieu ((ve cam) or (ve cac)) tuc va hanh vi ((su triet) or (su tien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang x hoi. hieu ((ve cam) OR (ve cac)) tuc va hanh vi ((su triet) OR (su tien)).
• Adding a wildcard symbol may retrieve word variants: tu sach y nang x hoi. hieu ((ve cam) or (ve cac)) tuc va hanh vi ((su triet) or (su tien))*.