Perhaps you should try some spelling variations:
dang nam » dong nam, dan nam, dung nam
cam thuc » am thuc, nam thuc, cam thu
cua tre » cua te, cuu tre, cua triet
hanh va » hang va, hanh vi
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
hieu ve » hieu va, hieu van
dang ma » dang mau, dang mam, dang mat
sac ky » cac ky
ve cam » ve cham, ve cac, va cam
va cua » va chua, via cua, ca cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sac ky) OR (sai ky)) ((dang ma) or (dang nam)) hoi. hieu ve cam thuc va hanh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sac ky) OR (sai ky)) ((dang ma) OR (dang nam)) hoi. hieu ve cam thuc va hanh va cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sac ky) OR (sai ky)) ((dang ma) or (dang nam)) hoi. hieu ve cam thuc va hanh va cua tre".
• Adding a wildcard symbol may retrieve word variants: te ((sac ky) OR (sai ky)) ((dang ma) or (dang nam)) hoi. hieu ve cam thuc va hanh va cua tre*.