Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
thuc dan » thuc hanh, hoc dan, thuc vat
hieu ve » hieu va, hieu van
dan dan » dang dan, ban dan, dao dan
cuu tre » cua tre, cau tren, cau treo
vu san » va san, vu ban
san ky » sang ky, van ky, dan ky
ve nam » he nam, va nam, le nam
dan di » danh di, dan da, dan de
di cuu » di cau, di cua, dinh cuu

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu san ky nang ((x ho) or (xa hoi)). hieu ve nam thuc dan dan di cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu san ky nang ((x ho) OR (xa hoi)). hieu ve nam thuc dan dan di cuu tre.
• Adding a wildcard symbol may retrieve word variants: vu san ky nang ((x ho) or (xa hoi)). hieu ve nam thuc dan dan di cuu tre*.