Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
ky dang » ky nang, ky danh
mam hoi » mam hoai, nam hoi, cham hoi
doan vi » doan va, don vi, doan thi
mai hoi » mai khoi, dai hoi, lai hoi
vi cua » vai cua, di cua
tu sac » tu sach, tu cac, tu san
tuc va » thuc va, truc va, duc va
sac ky » cac ky, sai ky
cua te » cua tu

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