Perhaps you should try some spelling variations:
cac thuc » cach thuc, cac thu, can thuc
sach ty » sach y, sach tu, sach thu
hieu va » lieu va, hieu qua
thuc va » thuc vat, thuc dan, thuc day
va dinh » van dinh, va kinh, va tinh
doi cua » dai cua, hoi cua
di cua » dai cua, de cua, do cua
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu ((sach ty) or (cac ky)) nang x hoi. hieu va cac thuc va dinh ((di cua) or (doi cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach ty) OR (cac ky)) nang x hoi. hieu va cac thuc va dinh ((di cua) OR (doi cua)) tre.
• Adding a wildcard symbol may retrieve word variants: thu ((sach ty) or (cac ky)) nang x hoi. hieu va cac thuc va dinh ((di cua) or (doi cua)) tre*.