Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
va thanh » gia thanh, ban thanh, va tinh
va hanh » van hanh, va danh, ban hanh
so sach » so sanh, bo sach, co sach
sach v » sach va, sach y, sach 2
ve cam » ve cham, ve cac, ve cai
v nang » va nang, vu nang, van nang
va cam » va cham, va cac, va cao
x hoi » xa hoi, o hoi, x ho
di va » dai va, di vao, doi va

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

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