Perhaps you should try some spelling variations:
thanh doi » thanh loi, thanh moi, thanh do
van thanh » ban thanh, van tuan
thu sach » tu sach, thuat sach, thuoc sach
thuc van » thuc vat, thuc dan, thuc va
cam thuc » am thuc, nam thuc, cam thu
hieu van » hieu va, thien van, lieu va
te sach » toc sach
van cam » van nam, van lam, van cau
doi cua » dai cua, hoi cua
tang ma » mang may, tang van
nang ma » sang ma, nang cao, mang may

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) or (thu sach)) ky ((nang ma) OR (tang ma)) hoi. hieu van cam thuc van thanh doi cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (thu sach)) ky ((nang ma) OR (tang ma)) hoi. hieu van cam thuc van thanh doi cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (thu sach)) ky ((nang ma) OR (tang ma)) hoi. hieu van cam thuc van thanh doi cua vat".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (thu sach)) ky ((nang ma) OR (tang ma)) hoi. hieu van cam thuc van thanh doi cua vat*.