Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
vien cac » vien bach, vien dai, vien da
va hanh » van hanh, va thanh, va danh
tu sach » thu sach, su sach, te sach
y nang » ky nang, ly nang, v nang
ve cam » ve cham, va cam, ve cai
xuc va » duc va, tuc va, luc va
ve cac » va cac
x hoi » xa hoi, o hoi, x ho
vi su » va su, ve su, ki su

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) OR (vien cac)))) xuc va hanh vi su triet~.
• 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) OR (vien cac)))) xuc va hanh vi su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang x hoi. hieu ((ve cam) or (((ve cac) OR (vien cac)))) xuc va hanh vi su triet".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang x hoi. hieu ((ve cam) or (((ve cac) OR (vien cac)))) xuc va hanh vi su triet*.