Perhaps you should try some spelling variations:
phan thuong » hang thuong, phan xuong
thuc phan » thuc pham, thu phan, thuc chan
hieu quoc » bieu quoc, tieu quoc, hieu thuoc
sach dai » sach dao, sach bai, sach dat
dai thuc » dan thuc, dai thu, dai thua
toc sach » hoc sach, doc sach, thuoc sach
sach thi » sach thu, sach tai, sach thieu
thi thuc » thai thuc, thi thu, thi thuy
viet duc » viet dung
tu sach » thu sach, su sach, te sach
thuc va » thuc vat, thuc dan, thuc day

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tu sach dai thuc phan thuong hieu quoc gia ) or ( toc sach thi thuc va thuong viet duc gia ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach dai thuc phan thuong hieu quoc gia ) OR ( toc sach thi thuc va thuong viet duc gia )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach dai thuc phan thuong hieu quoc gia ) or ( toc sach thi thuc va thuong viet duc gia ))*.