Perhaps you should try some spelling variations:
dan thiet » luan thiet, toan thiet, doan thien
tham xuc » tham nuoc, tham thuc, pham duc
van hanh » van thanh, van anh, van ban
ban hanh » ban hang
ky dang » ky nang, ky danh
dang ma » dang mau, dang mam, dang mat
hieu va » lieu va, hieu qua
va tham » van tham, va cham, va thanh
va hanh » va thanh, va danh, dao hanh
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
va dan » ca dan, va dao, va dau

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 va tham xuc ((va hanh) or (((van hanh) or (ban hanh)))) va dan thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky dang ma hoa. hieu va tham xuc ((va hanh) OR (((van hanh) OR (ban hanh)))) va dan thiet.
• Adding a wildcard symbol may retrieve word variants: tu sac ky dang ma hoa. hieu va tham xuc ((va hanh) or (((van hanh) or (ban hanh)))) va dan thiet*.