Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
vat hanh » vat thanh, van hanh, va hanh
nang doc » nang luc
cua tre » cua te, cua triet, dua tren
vi tham » vi pham, va tham, vi than
hieu vi » hieu voi, hieu va, hieu ve
sach ky » sach y, sach ty, sach kem
doc hoi » duoc hoi, hoc hoi, doc hai
cuu tre » cau tren, cau treo
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 doc hoi. hieu vi tham 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 doc hoi. hieu vi tham thuc vat hanh vi ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: thu ((sach ky) or (sac ky)) nang doc hoi. hieu vi tham thuc vat hanh vi ((cua tre) or (cuu tre))*.