Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
dinh dai » dinh dat, sinh dai, dinh dao
te sach » toc sach
hieu va » lieu va, hieu qua
thuc va » thuc vat, thuc dan, thuc day
va dinh » van dinh, va kinh, va tinh
cua tre » cua te, cuu tre, dua tren
ve cac » va cac, vien cac
x hoi » xa hoi, o hoi, x ho
va am » va lam, va cam

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

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