Perhaps you should try some spelling variations:
vu triet » su triet, ve triet, va triet
vien cac » vien bach, vien dai, vien da
hanh va » hang va, hanh vi
va hanh » van hanh, va thanh, va danh
sach ty » sach y, sach tu, sach thu
tu sach » thu sach, su sach, te sach
ty nang » ky nang, ty xang, ty hang
xuc va » duc va, tuc va, luc va
ve cam » ve cham, ve cac, va cam
o hoi » co hoi, o hoc, o hai
x hoi » xa hoi, x ho, 5 hoi
va vu » va vua, va su, va tu

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang ((x hoi) OR (o hoi)). hieu ((ve cam) OR (vien cac)) xuc va hanh va vu triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang ((x hoi) OR (o hoi)). hieu ((ve cam) or (vien cac)) xuc va hanh va vu triet~".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang ((x hoi) OR (o hoi)). hieu ((ve cam) or (vien cac)) xuc va hanh va vu triet*.