Perhaps you should try some spelling variations:
nghien thu » nghiem thuc, nghiep thuc, nghien cuu
cong coc » cong cuoc, cong cac, cong co
coc hang » hoc hang, oc hang, moc hoang
hang hoa » hang khoa, thanh hoa, hang va
nhan dan » phan dau, gian dan
nhan tai » hang tai, van tai, toan tai
toc cac » hoc cac, tuc cac, ton cac
cac thu » cach thuc, cac thoi
thu vat » thuc vat, thu va, thuat vat
hoc xa » hoc ma
hoi ca » hoi cua, hoi cac, hoi cau

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

• If you are trying to use Boolean operators, they must be ALL CAPS: toc cac thu vat, nghien thu cong coc hang hoa hoc xa hoi ca ((nhan dan) OR (nhan tai))~.
• Adding a wildcard symbol may retrieve word variants: toc cac thu vat, nghien thu cong coc hang hoa hoc xa hoi ca ((nhan dan) or (nhan tai))*.