Perhaps you should try some spelling variations:
dieu hien » dieu khien, dieu kien, bieu hien
vat thanh » dat thanh, gat thanh, tat thanh
thanh dai » thanh hai, thanh tai, thanh dat
sach thu » sach thue, sach thieu, sach tham
hien dan » hien dai, dien dan, thien dang
dan thuc » dan toc, am thuc
sach tu » cach tu, sach ty, sach uu
va hoa » van hoa, va hoc, ma hoa

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

• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach tu) OR (sach thu)) hang va hoa. dieu hien dan thuc vat thanh dai cua vat~.
• Adding a wildcard symbol may retrieve word variants: su ((sach tu) or (sach thu)) hang va hoa. dieu hien dan thuc vat thanh dai cua vat*.