Perhaps you should try some spelling variations:
van cham » van chat, van tham, va cham
hieu van » hieu va, thien van, lieu va
mai hoi » mai khoi, dai hoi, lai hoi
cua tre » cua te, cuu tre, cua triet
ma hoi » xa hoi, ma hoa, me hoi
sac ky » cac ky, sai ky
tuc va » thuc va, truc va, duc va
dan vi » doan vi, don vi, dan va
vi cua » vai cua, di cua
tu sac » tu sach, tu cac, tu san

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 ((ma hoi) or (mai hoi)). hieu van cham ((tuc va) or (tuc xa)) dan vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang ((ma hoi) OR (mai hoi)). hieu van cham ((tuc va) OR (tuc xa)) dan vi cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang ((ma hoi) or (mai hoi)). hieu van cham ((tuc va) or (tuc xa)) dan vi cua tre*.