Perhaps you should try some spelling variations:
vat hanh » vat thanh, van hanh, va hanh
tam thuc » tham thuc, am thuc, nam thuc
cua tre » cua te, cua triet, dua tren
sach ky » sach y, sach ty, sach kem
hieu vi » hieu voi, hieu va, hieu ve
nang co » nang cao, nang doc, nang noi
cuu tre » cau tren, cau treo
co hoi » co hoc, co loi
vi tam » vi tham, va tam, vi tai
sac ky » cac ky, sai ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu ((sach ky) or (sac ky)) nang co hoi. hieu vi tam thuc vat hanh vi ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach ky) OR (sac ky)) nang co hoi. hieu vi tam thuc vat hanh vi ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: thu ((sach ky) or (sac ky)) nang co hoi. hieu vi tam thuc vat hanh vi ((cua tre) or (cuu tre))*.