Perhaps you should try some spelling variations:
ve triet » va trien, su triet
vien cac » vien bach, vien dai, vien da
dinh va » dinh van, dinh ve, tinh va
va dinh » van dinh, va kinh, va tinh
tu sach » thu sach, su sach, te sach
ty nang » ky nang, ty hang, ly nang
ve cac » va cac
lao va » tao va, cao va, bao va
va ve » va de, va le, va vi

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) OR (ty xang)) cau hoi. hieu ((ve cac) OR (vien cac)) lao va dinh va ve triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ty nang) OR (ty xang)) cau hoi. hieu ((ve cac) or (vien cac)) lao va dinh va ve triet~".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ty nang) OR (ty xang)) cau hoi. hieu ((ve cac) or (vien cac)) lao va dinh va ve triet*.