Perhaps you should try some spelling variations:
khien hach » thien hach, khien thich, hien hanh
truc may » tren may, truc va
xuc may » xuc hay, phuc may
tinh va » tich va, trinh van, trinh vat
cuu tre » cua tre, cau tren, cau treo
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
va cuu » va cau, va chu, va huu
o hoi » co hoi, o hoc, o hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky nang ((xa hoi) or (o hoi)). dieu khien hach ((xuc may) or (truc may)) tinh va cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang ((xa hoi) OR (o hoi)). dieu khien hach ((xuc may) OR (truc may)) tinh va cuu tre.
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang ((xa hoi) or (o hoi)). dieu khien hach ((xuc may) or (truc may)) tinh va cuu tre*.