Perhaps you should try some spelling variations:
sach tu » sach thu, sach ty, sach uu
hai cua » thai cua, dai cua, hoi cua
dan hai » doan hai, dang hai, dan khai
thuc va » thuc vat, thuc dan, thuc day
mo thuc » mot thuc, do thuc, co thuc
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
nang xa » lang xa, nang ma, mang xa
cach tu » cach thuc
va dan » ca dan, va dao, va dau
va mo » va mot, va moi, vi mo

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sach tu) or (cach tu)) ((nang xa) or (nang x)) hoi. hieu va mo thuc va dan hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach tu) OR (cach tu)) ((nang xa) OR (nang x)) hoi. hieu va mo thuc va dan hai cua tre.
• Adding a wildcard symbol may retrieve word variants: te ((sach tu) or (cach tu)) ((nang xa) or (nang x)) hoi. hieu va mo thuc va dan hai cua tre*.