Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
van hanh » van thanh, ban hanh, van ban
sach ky » sac ky, sach y, sach ty
van anh » van thanh, tuan anh, van minh
so sach » so sanh, bo sach, co sach
nang xa » nang x, lang xa, nang ma
ve cam » ve cham, ve cac, ve cai
va cam » va cham, va cac, va cao
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 ky nang xa hoi. hieu ((ve cam) or (va cam)) thuc ((van hanh) OR (van anh)) di va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky nang xa hoi. hieu ((ve cam) OR (va cam)) thuc ((van hanh) OR (van anh)) di va triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky nang xa hoi. hieu ((ve cam) or (va cam)) thuc ((van hanh) OR (van anh)) di va triet*".