Perhaps you should try some spelling variations:
ky sang » ky dang, ky tang, duy sang
hieu vu » hieu va, hieu ve, hieu su
vu cham » va cham, vu kham, tu cham
cua tre » cua te, cuu tre, cua triet
tu sac » tu sach, tu cac, tu san
ma hoi » mai hoi, xa hoi, ma hoa
tuc va » thuc va, truc va, duc 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) or (ky nang)) ma hoi. hieu vu cham ((tuc va) or (tuc xa)) don vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ((ky sang) OR (ky nang)) ma hoi. hieu vu cham ((tuc va) OR (tuc xa)) don vi cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sac ((ky sang) or (ky nang)) ma hoi. hieu vu cham ((tuc va) or (tuc xa)) don vi cua tre*.