Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
van thanh » ban thanh, van tuan
qua tham » qua cham, qua than, qua thanh
thuc van » thuc vat, thuc dan, thuc va
thanh ki » thanh kim, thanh ky, thanh ke
tu sach » thu sach, te sach, tu cach
su sach » so sach, vu sach
tu tang » tuc tang, tu trang, tu tong
tang ma » mang may, tang van
su viet » so viet
ki su » ky su

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) or (su sach)) tu tang ma hoa. hieu qua tham thuc van thanh ki su viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) tu tang ma hoa. hieu qua tham thuc van thanh ki su viet.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) tu tang ma hoa. hieu qua tham thuc van thanh ki su viet*.