Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
va thanh » gia thanh, ban thanh, va tinh
hieu ve » hieu va, hieu van
thuc va » thuc vat, thuc dan, thuc day
vu sai » vu hai, vu dai, vu tai
de cua » le cua, te cua, dieu cua
di cua » dai cua, doi cua, do cua
ve nam » he nam, va nam, le nam
vu san » va san, vu ban
x hoi » xa hoi, o hoi, x ho

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

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