Perhaps you should try some spelling variations:
cua tre » cua te, cuu tre, cua triet
thuc va » thuc vat, thuc dan, thuc day
hieu vu » hieu va, hieu ve, hieu su
vu cham » va cham, vu kham, tu cham
ky sang » ky dang, ky tang, duy sang
ma hoi » mai hoi, xa hoi, ma hoa
dan vi » doan vi, don vi, dan va
vi cua » vai cua, di cua
tu san » thu san, tu ban, tu can

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu san ((ky sang) OR (ky nang)) ma hoi. hieu vu cham ((thuc va) or (tuc xa)) dan vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu san ((ky sang) OR (ky nang)) ma hoi. hieu vu cham ((thuc va) OR (tuc xa)) dan vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu san ((ky sang) OR (ky nang)) ma hoi. hieu vu cham ((thuc va) or (tuc xa)) dan vi cua tre".
• Adding a wildcard symbol may retrieve word variants: tu san ((ky sang) OR (ky nang)) ma hoi. hieu vu cham ((thuc va) or (tuc xa)) dan vi cua tre*.