Perhaps you should try some spelling variations:
vat hanh » vat thanh, van hanh, nhat hanh
va triet » va thiet, va trien, ve triet
su sach » so sach, vu sach
va hanh » van hanh, va thanh, va danh
y nang » ky nang, ly nang, v nang
ve cam » ve cham, va cam, ve cai
ve cac » va cac, vien cac
ve va » ve van, te va, ke va

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

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