Perhaps you should try some spelling variations:
thuc dan » thuc hanh, hoc dan, thuc vat
hai thuc » thai thuc, dai thuc, ha thuc
cua tre » cua te, cuu tre, cua triet
hieu va » hieu qua
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, nang cao
dan anh » dan canh, dan hanh, van anh
vi cua » vai cua, di cua
anh vi » hanh vi, anh va, anh ve
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sac ky ((nang xa) or (nang ma)) hoi. ((lieu va) or (hieu va)) hai thuc dan anh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky ((nang xa) OR (nang ma)) hoi. ((lieu va) OR (hieu va)) hai thuc dan anh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: su sac ky ((nang xa) or (nang ma)) hoi. ((lieu va) or (hieu va)) hai thuc dan anh vi cua tre*.