Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
thuc van » thuc vat, thuc dan, thuc va
nam thuc » nam thuoc, am thuc, nam thu
hieu va » lieu va, hieu qua
hanh di » hanh vi, hanh de, hang di
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu van
vu sac » vu sach, vu san, va sac
di cua » dai cua, doi cua, de cua
cua te » cua tu
sac ky » cac ky, sai ky
ma hoi » xa hoi, ma hoa, me hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sac ky nang ((ma hoi) or (mai hoi)). ((hieu ve) OR (hieu va)) nam thuc van hanh di cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sac ky nang ((ma hoi) OR (mai hoi)). ((hieu ve) OR (hieu va)) nam thuc van hanh di cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sac ky nang ((ma hoi) or (mai hoi)). ((hieu ve) OR (hieu va)) nam thuc van hanh di cua te".
• Adding a wildcard symbol may retrieve word variants: vu sac ky nang ((ma hoi) or (mai hoi)). ((hieu ve) OR (hieu va)) nam thuc van hanh di cua te*.