Perhaps you should try some spelling variations:
van thiet » dan thiet, can thiet, van thien
cham xuc » cam xuc, chat xuc, cham soc
ky dang » ky nang, ky danh
dang ma » dang mau, dang mam, dang mat
hieu ve » hieu van
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
xuc va » duc va, tuc va, luc va

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

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