Perhaps you should try some spelling variations:
nam thuc » nam thuoc, nam thu, nam tu
van hanh » van thanh, ban hanh, van anh
ky danh » ky anh, ky dang
danh xa » danh ca, dinh xa, canh xa
hieu ve » hieu va, hieu van
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
vai va » mai va, dai va, hai va
vi va » vi van, vu va, bi 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 danh xa hoi. hieu ve ((nam thuc) or (am thuc)) van hanh ((vi va) or (vai va)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky danh xa hoi. hieu ve ((nam thuc) OR (am thuc)) van hanh ((vi va) OR (vai va)) triet.
• Adding a wildcard symbol may retrieve word variants: tu sac ky danh xa hoi. hieu ve ((nam thuc) or (am thuc)) van hanh ((vi va) or (vai va)) triet*.