Perhaps you should try some spelling variations:
van thiet » va thiet, dan thiet, can thiet
chat xuc » chat huu, cam xuc, chao xu
van hanh » van thanh, ban hanh, van anh
su sach » so sach, vu sach
ky tang » ky dang, kho tang, ky trong
hieu ve » hieu va, hieu van
ve chat » va chat, van chat
xuc van » duc van, luc van, vuc van

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ((ky tang) OR (ky nang)) xa hoi. hieu ve chat xuc van hanh vi van thiet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ky tang) OR (ky nang)) xa hoi. hieu ve chat xuc van hanh vi van thiet".
• Adding a wildcard symbol may retrieve word variants: su sach ((ky tang) OR (ky nang)) xa hoi. hieu ve chat xuc van hanh vi van thiet*.