Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
van hanh » van thanh, ban hanh, van anh
va hanh » va thanh, va danh, ban hanh
te sach » toc sach
sach ky » sac ky, sach y, sach ty
vu cham » va cham, vu kham, tu cham
nang xa » nang x, lang xa, nang ma
va chat » van chat, va phat, cao chat
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: te sach ky nang xa hoi. hieu ((vu cham) or (va chat)) thuc ((va hanh) OR (van hanh)) di va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang xa hoi. hieu ((vu cham) OR (va chat)) thuc ((va hanh) OR (van hanh)) di va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang xa hoi. hieu ((vu cham) or (va chat)) thuc ((va hanh) OR (van hanh)) di va triet".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang xa hoi. hieu ((vu cham) or (va chat)) thuc ((va hanh) OR (van hanh)) di va triet*.