Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
dang xay » dang van, van xay
ban hanh » ban hang
viec cac » vien cac, viec lam, viec va
van anh » van thanh, tuan anh, van minh
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky nang, ky danh
vi va » vi van, vai va, vu 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 dang xay hoi. hieu ((viec cac) OR (viec cua)) tac ((ban hanh) or (van anh)) vi va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky dang xay hoi. hieu ((viec cac) OR (viec cua)) tac ((ban hanh) OR (van anh)) vi va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky dang xay hoi. hieu ((viec cac) OR (viec cua)) tac ((ban hanh) or (van anh)) vi va triet".
• Adding a wildcard symbol may retrieve word variants: so sach ky dang xay hoi. hieu ((viec cac) OR (viec cua)) tac ((ban hanh) or (van anh)) vi va triet*.