Perhaps you should try some spelling variations:
nam thuc » nam thuoc, nam thu, nam tu
hieu ve » hieu va, hieu van
dan dan » dang dan, ban dan, dao dan
cau tre » cau tren, cau treo, cau tra
vu sac » vu sach, vu san, va sac
sac ky » cac ky, sai ky
dan di » danh di, dan da, dan de
di cau » da cau, diem cau

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 ((x ho) or (xa hoi)). hieu ve ((nam thuc) OR (am thuc)) dan dan di cau tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sac ky nang ((x ho) OR (xa hoi)). hieu ve ((nam thuc) OR (am thuc)) dan dan di cau tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sac ky nang ((x ho) or (xa hoi)). hieu ve ((nam thuc) OR (am thuc)) dan dan di cau tre*".