Perhaps you should try some spelling variations:
dan thuong » dang thuong, dan phuong, han thuong
hieu thue » bieu thue, hieu thuc, hieu thuoc
sach tham » sach nha
tham thuc » nham thuc, pham thuc, tam thuc
viet quoc » viec quoc, viet duc, viet goc
sanh dai » sinh dai, sanh dan, vanh dai
dai thuc » dan thuc, dai thu, dai thua
thue gia » phu gia
thuc dan » thuc hanh, hoc dan, thuc vat
tu sanh » tu hanh, tu manh, tu san
thuc va » thuc vat, thuc day
tu sach » thu sach, su sach, te sach

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

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