Perhaps you should try some spelling variations:
van thiet » va thiet, dan thiet, can thiet
chat xuc » cam xuc, chao xu, chat cua
chat huu » pham huu
van hanh » van thanh, ban hanh, van anh
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van

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 lang xa hoi. hieu ve ((chat xuc) OR (chat huu)) van hanh vi van thiet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky lang xa hoi. hieu ve ((chat xuc) OR (chat huu)) van hanh vi van thiet".
• Adding a wildcard symbol may retrieve word variants: so sach ky lang xa hoi. hieu ve ((chat xuc) OR (chat huu)) van hanh vi van thiet*.