Perhaps you should try some spelling variations:
day thuong » day phuong, dau thuong, dang thuong
sach tham » sach nha
tham thuc » nham thuc, pham thuc, tam thuc
viet theo » viet tien, viet thuc, viet tiep
tri thuoc » tri thuc, tri hoc, tin thuoc
thuoc day » thuc day, thuoc dac, thuoc dang
theo dia » theo giao, tren dia, he dia
sach tri » sach tai, sach tren, sach truc
hieu luc » hieu luat, hieu qua
tu sach » thu sach, su sach, te sach
thuc va » thuc vat, thuc dan, thuc day
luc ma » luc va, luc ha, suc ma

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 tham thuc va thuong viet theo dia ) or ( tu sach tri thuoc day thuong hieu luc ma ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach tham thuc va thuong viet theo dia ) OR ( tu sach tri thuoc day thuong hieu luc ma )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach tham thuc va thuong viet theo dia ) or ( tu sach tri thuoc day thuong hieu luc ma ))*.