Perhaps you should try some spelling variations:
dan thanh » dang thanh, danh thanh, ban thanh
cua triet » cua viet, su triet, va triet
nam thuc » nam thuoc, am thuc, nam thu
thuc dan » thuc hanh, hoc dan, thuc vat
thanh di » thanh doi, thanh de, thanh do
te cach » ve cach, te sach, tu cach
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, dua tren
te cac » tu cac, ve cac, te cao
ve nam » he nam, va nam, le nam

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

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