Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
sang tay » sang tao, sang tai, sang tac
ky sang » ky nang, ky dang, ky tang
tay hoi » tay ho, tao hoi, tay thai
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
thuc va » thuc vat, thuc dan, thuc day
doan vi » don vi, doan thi, doan van
cua tre » cua te, cuu tre, cua triet
tu sac » tu sach, tu cac, tu san
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: tu sac ky sang tay hoi. hieu ve pham thuc va ((doan vi) or (doan va)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky sang tay hoi. hieu ve pham thuc va ((doan vi) OR (doan va)) cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sac ky sang tay hoi. hieu ve pham thuc va ((doan vi) or (doan va)) cua tre*.