Perhaps you should try some spelling variations:
chat thuc » thuat thuc, nhan thuc, chat thai
van chat » cao chat
hieu van » hieu va, thien van, lieu va
thuc va » thuc vat, thuc dan, thuc day
cua tre » cuu tre, cua triet, dua tren
nang ma » tang ma, sang ma, nang cao
don vai » don vi, don va, den vai
va don » va dong, va doc, va do
tu can » tu ban, tu cac, thu canh
can ky » van ky, dan ky, ban ky
cua te » cua tu

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu can ky ((nang x) OR (nang ma)) hoi. hieu van chat thuc va don vai ((cua tre) OR (cua te))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu can ky ((nang x) or (nang ma)) hoi. hieu van chat thuc va don vai ((cua tre) OR (cua te))~".
• Adding a wildcard symbol may retrieve word variants: tu can ky ((nang x) or (nang ma)) hoi. hieu van chat thuc va don vai ((cua tre) OR (cua te))*.