Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nam thuc, nham thu
xanh tra » thanh tra, khanh tra, hanh tram
ky tang » ky nang, ky dang, kho tang
hieu ve » hieu va, hieu van
ve nham » ve nha, ve cham
thuc va » thuc vat, thuc dan, thuc day
va xanh » va danh, va hanh, va anh
tra cuu » tra cau, trau cua, trua cua
cuu tre » cua tre, cau tren, cau treo
vu ban » tu ban, va ban
ban ky » van ky, dan ky
ma hoi » mai 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 ban ky tang ((ma hoi) or (xa hoi)). hieu ve nham thuc va xanh tra cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu ban ky tang ((ma hoi) OR (xa hoi)). hieu ve nham thuc va xanh tra cuu tre*.