Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
van thanh » ban thanh, van tuan
thuc van » thuc vat, thuc dan, thuc va
nam thuc » nam thuoc, am thuc, nam thu
hieu he » hieu ve, hiem he, hieu le
nang ma » tang ma, nang cao, mang may
sang ma » tang ma, sang tao, mang may
he nam » ha nam, nghe nam
sac ky » cac ky, sai ky
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) or (sac ky)) ((nang ma) OR (sang ma)) hoi. hieu he nam thuc van thanh dai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach y) OR (sac ky)) ((nang ma) OR (sang ma)) hoi. hieu he nam thuc van thanh dai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach y) or (sac ky)) ((nang ma) OR (sang ma)) hoi. hieu he nam thuc van thanh dai cua te".
• Adding a wildcard symbol may retrieve word variants: su ((sach y) or (sac ky)) ((nang ma) OR (sang ma)) hoi. hieu he nam thuc van thanh dai cua te*.