Perhaps you should try some spelling variations:
nam thuc » nam thuoc, nam thu, nam tu
van hanh » van thanh, ban hanh, van anh
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
va sac » va cac, va suc, va san
sac ky » cac ky, sai ky
ma hoi » mai hoi, xa hoi, ma hoa
vi cua » vai cua, di cua
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: va sac ky nang ma hoi. hieu ve ((nam thuc) OR (am thuc)) van hanh vi cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "va sac ky nang ma hoi. hieu ve ((nam thuc) OR (am thuc)) van hanh vi cua te".
• Adding a wildcard symbol may retrieve word variants: va sac ky nang ma hoi. hieu ve ((nam thuc) OR (am thuc)) van hanh vi cua te*.