Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
hieu van » hieu va, thien van, lieu va
hanh tai » thanh tai, hang tai, han tai
hanh va » hang va, hanh vi
thuc va » thuc vat, thuc dan, thuc day
cua tre » cua te, cuu tre, cua triet
dang ma » dang mau, dang mam, dang mat
ky dang » ky nang, ky danh
te san » te ban, ke san, tu san
te sac » te sach, te cac

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