Perhaps you should try some spelling variations:
van thiet » va thiet, dan thiet, van thien
can thiet » dan thiet, cac thiet, cad thiet
cham xuc » cam xuc, chat xuc, cham soc
van hanh » van thanh, ban hanh, van anh
ky dang » ky nang, ky danh
dang ma » dang mau, dang mam, dang mat
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
va hanh » va thanh, va danh, ban hanh
tu ban » thu ban, te ban
ban ky » van ky, dan ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ban ky dang ma hoa. hieu ve cham xuc ((va hanh) or (van hanh)) vi ((van thiet) OR (can thiet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ban ky dang ma hoa. hieu ve cham xuc ((va hanh) OR (van hanh)) vi ((van thiet) OR (can thiet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ban ky dang ma hoa. hieu ve cham xuc ((va hanh) or (van hanh)) vi ((van thiet) OR (can thiet))".
• Adding a wildcard symbol may retrieve word variants: tu ban ky dang ma hoa. hieu ve cham xuc ((va hanh) or (van hanh)) vi ((van thiet) OR (can thiet))*.