Perhaps you should try some spelling variations:
sang tao » hang tai
cam thuc » am thuc, nam thuc, cam thu
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
sang ma » tang ma, nang ma, mang may
dan dai » dat dai, can dai, dan dat
hieu ve » hieu van
thuc va » thuc vat, thuc dan, thuc day
va dan » ca dan, va dao, va dau
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach y ((sang ma) OR (sang tao)) hoi. ((hieu ve) or (hieu va)) cam thuc va dan dai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y ((sang ma) OR (sang tao)) hoi. ((hieu ve) OR (hieu va)) cam thuc va dan dai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y ((sang ma) OR (sang tao)) hoi. ((hieu ve) or (hieu va)) cam thuc va dan dai cua te".
• Adding a wildcard symbol may retrieve word variants: su sach y ((sang ma) OR (sang tao)) hoi. ((hieu ve) or (hieu va)) cam thuc va dan dai cua te*.