Perhaps you should try some spelling variations:
ky sang » ky nang, ky dang, ky tang
sang ma » tang ma, nang ma, sang tao
hieu vu » hieu va, hieu ve, hieu su
vu cham » va cham, vu kham, tu cham
truc va » thuc va, thuc vat, trung va
cua tre » cua te, cuu tre, cua triet
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
ma hoi » mai hoi, xa hoi, ma hoa
dan vi » doan vi, don vi, dan va
vi cua » vai cua, di cua

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