Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
thuc dan » thuc hanh, hoc dan, thuc vat
hang di » hang doi, hang vi, hang dien
hanh di » hanh vi, hanh de, danh di
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
te sach » toc sach
ve nam » he nam, va nam, le nam
te sac » te cac, te san

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 sach)) ky nang x ho. hieu ve nam thuc dan ((hanh di) OR (hang di)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sac) OR (te sach)) ky nang x ho. hieu ve nam thuc dan ((hanh di) OR (hang di)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sac) or (te sach)) ky nang x ho. hieu ve nam thuc dan ((hanh di) OR (hang di)) cua tre".
• Adding a wildcard symbol may retrieve word variants: ((te sac) or (te sach)) ky nang x ho. hieu ve nam thuc dan ((hanh di) OR (hang di)) cua tre*.