Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
day thanh » dao thanh, dat thanh, da thanh
nam thuc » nam thuoc, am thuc, nam thu
thanh vi » hanh vi, thanh va, thanh ve
thuc day » thuc dan, thuc vat
vu khanh » vu thanh, van khanh, le khanh
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, dua tren
y nang » ky nang, ly nang, v nang
ve nam » he nam, va nam, le nam
x hoi » xa hoi, o hoi, x ho

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

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