Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
day hanh » day nhanh, day thanh, dao hanh
thuc day » thuc dan, thuc vat
nang doc » nang luc
thu sac » thu sach, thu san, thu xac
cua tre » cua te, cua triet, dua tren
ve tham » va tham, ve cham, vi tham
hieu ve » hieu va, hieu van
nang co » nang cao, nang noi, nang hoc
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 sac ky ((nang co) or (nang doc)) hoi. hieu ve tham thuc day hanh vi ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sac ky ((nang co) OR (nang doc)) hoi. hieu ve tham thuc day hanh vi ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: thu sac ky ((nang co) or (nang doc)) hoi. hieu ve tham thuc day hanh vi ((cua tre) or (cuu tre))*.