Perhaps you should try some spelling variations:
tham luc » than luc, tham nuoc, tham thuc
van hanh » van thanh, ban hanh, van anh
cua viet » ca viet, hoa viet, cua dieu
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
va tham » van tham, va cham, va thanh
luc van » luoc van, luu van, duc van
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
ma hoi » mai hoi, xa hoi, ma hoa

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 nang ma hoi. hieu va tham luc van hanh vi ((va thiet) or (((cua viet) or (cua vat))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang ma hoi. hieu va tham luc van hanh vi ((va thiet) OR (((cua viet) OR (cua vat)))).
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang ma hoi. hieu va tham luc van hanh vi ((va thiet) or (((cua viet) or (cua vat))))*.